fix(deps): Remove runtime/frankenphp-symfony dependency

[7-zete-7]

The latest version of Symfony v7.4 introduces native runner support for FrankenPHP (see symfony/symfony#60503). The current new project initialization script explicitly adds the runtime/frankenphp-symfony dependency, which is no longer needed for projects running the latest version of Symfony.

For Symfony v8.0 (the default version), adding the runtime/frankenphp-symfony package results in an error (see #872).

Details

Creating a "symfony/skeleton " project at "./tmp"
The repository at "/app" does not have the correct ownership and git refuses to use it:

fatal: detected dubious ownership in repository at '/app'
To add an exception for this directory, call:

       git config --global --add safe.directory /app

Installing symfony/skeleton (v8.0.99)
  - Downloading symfony/skeleton (v8.0.99)
  - Installing symfony/skeleton (v8.0.99): Extracting archive
Created project in /app/tmp
/app
The repository at "/app" does not have the correct ownership and git refuses to use it:

fatal: detected dubious ownership in repository at '/app'
To add an exception for this directory, call:

       git config --global --add safe.directory /app

./composer.json has been updated
The repository at "/app" does not have the correct ownership and git refuses to use it:

fatal: detected dubious ownership in repository at '/app'
To add an exception for this directory, call:

       git config --global --add safe.directory /app

Running composer update php runtime/frankenphp-symfony
Loading composer repositories with package information
Updating dependencies
Lock file operations: 18 installs, 0 updates, 0 removals
  - Locking psr/container (2.0.2)
  - Locking psr/event-dispatcher (1.0.0)
  - Locking psr/log (3.0.2)
  - Locking runtime/frankenphp-symfony (0.2.0)
  - Locking symfony/dependency-injection (v7.4.0)
  - Locking symfony/deprecation-contracts (v3.6.0)
  - Locking symfony/error-handler (v8.0.0)
  - Locking symfony/event-dispatcher (v8.0.0)
  - Locking symfony/event-dispatcher-contracts (v3.6.0)
  - Locking symfony/flex (v2.10.0)
  - Locking symfony/http-foundation (v8.0.0)
  - Locking symfony/http-kernel (v7.4.0)
  - Locking symfony/polyfill-mbstring (v1.33.0)
  - Locking symfony/polyfill-php85 (v1.33.0)
  - Locking symfony/runtime (v7.4.0)
  - Locking symfony/service-contracts (v3.6.1)
  - Locking symfony/var-dumper (v8.0.0)
  - Locking symfony/var-exporter (v8.0.0)
Writing lock file
Installing dependencies from lock file (including require-dev)
Package operations: 18 installs, 0 updates, 0 removals
  - Downloading symfony/runtime (v7.4.0)
  - Downloading symfony/flex (v2.10.0)
  - Downloading symfony/polyfill-mbstring (v1.33.0)
  - Downloading symfony/http-foundation (v8.0.0)
  - Downloading psr/event-dispatcher (1.0.0)
  - Downloading symfony/event-dispatcher-contracts (v3.6.0)
  - Downloading symfony/event-dispatcher (v8.0.0)
  - Downloading symfony/var-dumper (v8.0.0)
  - Downloading symfony/polyfill-php85 (v1.33.0)
  - Downloading psr/log (3.0.2)
  - Downloading symfony/error-handler (v8.0.0)
  - Downloading symfony/deprecation-contracts (v3.6.0)
  - Downloading symfony/http-kernel (v7.4.0)
  - Downloading symfony/var-exporter (v8.0.0)
  - Downloading psr/container (2.0.2)
  - Downloading symfony/service-contracts (v3.6.1)
  - Downloading symfony/dependency-injection (v7.4.0)
  - Downloading runtime/frankenphp-symfony (0.2.0)
  - Installing symfony/runtime (v7.4.0): Extracting archive
  - Installing symfony/flex (v2.10.0): Extracting archive
  - Installing symfony/polyfill-mbstring (v1.33.0): Extracting archive
  - Installing symfony/http-foundation (v8.0.0): Extracting archive
  - Installing psr/event-dispatcher (1.0.0): Extracting archive
  - Installing symfony/event-dispatcher-contracts (v3.6.0): Extracting archive
  - Installing symfony/event-dispatcher (v8.0.0): Extracting archive
  - Installing symfony/var-dumper (v8.0.0): Extracting archive
  - Installing symfony/polyfill-php85 (v1.33.0): Extracting archive
  - Installing psr/log (3.0.2): Extracting archive
  - Installing symfony/error-handler (v8.0.0): Extracting archive
  - Installing symfony/deprecation-contracts (v3.6.0): Extracting archive
  - Installing symfony/http-kernel (v7.4.0): Extracting archive
  - Installing symfony/var-exporter (v8.0.0): Extracting archive
  - Installing psr/container (2.0.2): Extracting archive
  - Installing symfony/service-contracts (v3.6.1): Extracting archive
  - Installing symfony/dependency-injection (v7.4.0): Extracting archive
  - Installing runtime/frankenphp-symfony (0.2.0): Extracting archive
Generating autoload files
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Run composer recipes at any time to see the status of your Symfony recipes.

The repository at "/app" does not have the correct ownership and git refuses to use it:

fatal: detected dubious ownership in repository at '/app'
To add an exception for this directory, call:

       git config --global --add safe.directory /app

Loading composer repositories with package information
Restricting packages listed in "symfony/symfony" to "8.0.*"
Updating dependencies
Your requirements could not be resolved to an installable set of packages.

  Problem 1
    - Root composer.json requires runtime/frankenphp-symfony * -> satisfiable by runtime/frankenphp-symfony[0.1.0, 0.1.1, 0.2.0].
    - runtime/frankenphp-symfony[0.1.0, ..., 0.1.1] require symfony/dependency-injection ^5.4 || ^6.0 -> found symfony/dependency-injection[v5.4.0, ..., v5.4.48, v6.0.0, ..., v6.4.26] but these were not loaded, likely because it conflicts with another require.
    - runtime/frankenphp-symfony 0.2.0 requires symfony/dependency-injection ^5.4 || ^6.0 || ^7.0 -> found symfony/dependency-injection[v5.4.0, ..., v5.4.48, v6.0.0, ..., v6.4.26, v7.0.0, ..., v7.4.0] but these were not loaded, likely because it conflicts with another require.

Use the option --with-all-dependencies (-W) to allow upgrades, downgrades and removals for packages currently locked to specific versions.

No security vulnerability advisories found.
Using version ^0.2.0 for runtime/frankenphp-symfony
The repository at "/app" does not have the correct ownership and git refuses to use it:

fatal: detected dubious ownership in repository at '/app'
To add an exception for this directory, call:

       git config --global --add safe.directory /app

grep: .env: No such file or directory
Could not open input file: bin/console
Could not open input file: bin/console
Could not open input file: bin/console

With this PR, I propose removing the addition of the runtime/frankenphp-symfony dependency and explicitly indicating to Symfony which runtime should be used via the APP_RUNTIME env.

[7-zete-7]

CI / Lint failed due the #874.