Meet/1.x/#24 regression tests and GitHub check

[me146]

This PR enhances the AiAssist and AiAssistEditing plugins with improved test coverage and configuration handling.

• Added tests for AiAssistEditing to verify plugin loading, command registration, and Enter key handling.
• Expanded AiAssist tests to check for required configurations and default settings.
• Ensured errors are thrown for missing apiKey and invalid temperature values.
• Updated schema to allow necessary elements, preventing insertion errors.

[jjroelofs]

As we discussed earlier, please split up this PR into multiple PR, one test file per pull request. There is so much to review here, it will take me weeks with all the other things I have to do :)

[jjroelofs]

@me146 please also make the commit messages more descriptive, better ask ChatGPT to write a comprehensive commit message based on your changes.