BUG: All github-realted `./api` endpoints fails when github service fails

[ZibanPirate]

Describe the bug

• whenever GitHub service calls fail, the API endpoint fails too, even though we have cache data that we can fallback to

To Reproduce You need to stress test it to reproduce it.

• either: make many changes to the GitHub repo that is listed in dzcode.io/contibute
• or, mock the Github service in ./api and make it fail (throw an error)

Expected behavior

• it should fall back to the cache responses.

Screenshots

Environment:

• OS: All
• Browser: All
• Version: v4.0.0

Additional context

• reported by Sentry here: https://sentry.io/share/issue/acd25f6d554344b9a42908a33c8a913a/