Tests: Stricter components.json tests

[RunDevelopment]

This adds 3 new tests for components.json that should make reviewing easier.

1. alias, optional, require, and modify are now checked for single-element arrays. Instead of using "alias": ["foo"] it will suggest to use "alias": "foo".
2. Alias titles are now validated. It's checked that:
   1. The alias of an alias title is in the alias list.
   2. Each alias title is different from title.
3. All entries are now checked for unknown properties to prevent typos.

[github-actions]

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