refactor: remove discussions html url workaround

[setchy]

trafficstars

📝 Provide a description of the new feature

See #1582

Monitor the GitHub API to see if/when we can remove our discussions URL workaround, and also remove our GraphQL discussions search logic

➕ Additional Information

No response

[setchy]

Verified today that this discussions workaround is still required

[setchy]

Closing this as it seems to have become a "Feature" of GitHub's API and the workaround will continue as a permanent fix

I'll leave the comment in the code explaining why