Refactor: Extract RepoMetaData to own file

[glensc]

Resolve TODO:

// TODO: extract out from BitBucket specifically, or create our own type

[glensc]

Manually excluded formatting changes (git commit --amend --no-verify) and moved them all to a separate PR:

• https://github.com/danger/danger-js/pull/1358

[github-actions[bot]]

	Warnings
:warning:	Please add a changelog entry for your changes. You can find it in `CHANGELOG.md` Please add your change and name to the main section.

Generated by :no_entry_sign: dangerJS against aff863c5204aea45a5c87fa1c9d613fdd5036c3b

[glensc]

@orta this is ready

[orta]

Thanks, looks solid to me