Support Gitea's organization-wide labels

[proton-ab]

What would you like Renovate to be able to do?
Assign requested label on PR upon creation

Describe the solution you'd like
Renovate should send additional request to Gitea in order to resolve IDs of organization labels

Describe alternatives you've considered
There is no alternative short of forcing end-user to not use this Gitea functionality, the end result is confusing to user as the config is valid but label is never applied.

Additional context
Gitea added support for organization-wide labels in go-gitea/gitea#10814. Such labels exist on all repositories that belong to organization and can be used like repository-native label. The only different is that second API call must be done in order to get ID<->Name mapping for such labels.

I have implemented support for organization labels in PR #6000, this issue is for tracking purposes only.

[renovate-release]

🎉 This issue has been resolved in version 19.216.0 🎉

The release is available on:

• GitHub release
• 19.216.0

Your semantic-release bot 📦🚀