Purge old connector definition files

[tuliren]

Summary

• Relates to Simplification of version bumping #7668.
• These individual connector definitions are no longer needed. They are still in the repo for backward compatibility.
• They are creating lots of confusing for connector contributors.

🚨 User Impact 🚨

• Roughly, it will break Airbyte versions older than 0.27.1-alpha. The exact version is unknown.
  • The dependency on Github was removed in Github Store should not error if the file cannot be found. #4455.
• But those versions are very out-of-date, and should be upgraded any way.

[sherifnada]

LGTM, @jrhizor I think we should get rid of these as they still cause confusion for contributors and contractors. WDYT?

[jrhizor]

Go for it. Maybe give heads up to USE in case they get questions?

[tuliren]

Will merge after #10331 is merged.