This PR aims to do some simple refactors of the ReleasesApiConsumer class and associated code. There is more refactoring I want to do but I'm breaking it up into multiple PRs.

Each change is made in a separate commit, and a lot of it is just moving code around, so I recommend looking at each commit individually.

The changes we make are:

• Move various classes out of distribution.ts and into their own files
• Use newer methods of defining fields instead of having to prefix with underscores
• Add / adjust comments on classes and methods
• Move the tests of ReleasesApiConsumer out of the no-workspace tests and into unit-tests so they'll be faster
• Merge owner name and repo name into a single repo NWO field, because after Remove ownerName and repositoryName from DistributionConfig #3183 we no longer need to be able to specify them individually anywhere

This PR deliberately does not attempt to change the parameters of the getLatestRelease method. I think that change will be a little more complicated so I wanted to save that for another PR.

Checklist

• CHANGELOG.md has been updated to incorporate all user visible changes made by this pull request.
• Issues have been created for any UI or other user-facing changes made by this pull request.
• [Maintainers only] If this pull request makes user-facing changes that require documentation changes, open a corresponding docs pull request in the github/codeql repo and add the ready-for-doc-review label there.