Setup QLTY for code coverage and linting

[olbrich]

This pull request introduces integration with Qlty Cloud for code coverage reporting, adds configuration files for Qlty, and makes several minor code and configuration improvements. The most significant changes are grouped below.

Qlty Cloud Integration:

• Added Qlty Cloud coverage reporting to the GitHub Actions workflow by invoking qlty-action/coverage after tests, using a secret token and the coverage result file.
• Added .qlty/qlty.toml configuration file and .qlty/.gitignore to support Qlty CLI and Cloud, specifying exclude and test patterns, code smell thresholds, and source configuration. [1] [2]

Configuration and Linting Improvements:

• Updated .rubocop.yml to use the new plugins key instead of the deprecated require for RuboCop extensions.

Code Quality and Minor Fixes:

• Improved boolean logic and code clarity in lib/ruby_units/unit.rb and lib/ruby_units/math.rb by simplifying conditionals and using more idiomatic Ruby syntax. [1] [2]
• Made minor improvements to string formatting and parsing in lib/ruby_units/unit.rb for better readability and maintainability. [1] [2] [3]
• Minor fix in test spec to remove unnecessary parentheses in the construction of a RubyUnits::Unit.

These changes collectively enhance test coverage visibility, code quality, and maintainability.

[Copilot]

Pull request overview

This pull request integrates Qlty Cloud for code coverage reporting and implements various code quality improvements identified by linting tools. The changes modernize configuration files and refactor code to use more idiomatic Ruby syntax without altering functionality.

• Adds Qlty Cloud integration to GitHub Actions workflow for automated code coverage reporting
• Updates RuboCop configuration to use the modern plugins key instead of deprecated require
• Refactors boolean logic and string interpolation to more idiomatic Ruby patterns

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
.github/workflows/tests.yml	Adds Qlty coverage reporting step after test execution
.qlty/qlty.toml	Auto-generated Qlty configuration with code smell thresholds and exclusion patterns
.qlty/.gitignore	Gitignore rules for Qlty directory to track only configuration files
.rubocop.yml	Updates to use modern plugins configuration key
lib/ruby_units/unit.rb	Simplifies boolean logic, improves string interpolation idioms, and adds rubocop disable comments
lib/ruby_units/math.rb	Removes unnecessary parentheses in compound boolean expressions
spec/ruby_units/math_spec.rb	Removes unnecessary parentheses in test subject definition

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