[Change Request] Last things to do before releasing v5.0

[bartvanb]

Description
This issue is meant to gather specific, more extensive tests that we need to do before releasing v5.0, that for some reason or other, we cannot do yet.

Things that might be done at any time point:

• Check that new algorithm template creator is fully correct
• Check that the @metadata decorator works: [Bug] @metadata decorator is broken for non extraction jobs #1904

Last things:

• Check that CSP headers in the UI nginx configuration are set properly.
  • We cannot test this now because we are using the dev Docker image for the UI in the devspace environment
  • We can test it once CLI commands to run UI with proper image are in place
• Release new tag on the algorithm template creator repo
  • Ensure doing the changes listed here: [Change Request] Last actions before creating a v5 release v6-algorithm-template#13
• Setting up community services
• Resolve remaining v5+ TODOs
  • In the helm_install() function, remove the --devel argument that currently is needed to allow using prerelease charts
  • remove --prerelease=allow note in quickstart section of the docs - it is necessary only while no final release is present

Asap after releasing 5.0 (some may also be done before):

• Deploying community services to latest version
• Release one v5 algorithm that contains the default extraction methods
  • Should the other images also contain them?
• Migrating community algorithms to v5
  • Release the v5 version of v6 diagnosistics as the latest image: merge Changes/v5 compatibility v6-diagnostics#8 and then do make publish
  • After releasing average algorithm, validate that Python client docs are functional: https://docs.vantage6.ai/en/main/user/pyclient.html
• Making algorithms available in v5 community store