feat: ignore unavailable users

[fgreinacher]

Changes:

Add logic to filter unavailable users to PR worker and platform API.

Currently this will only have an effect on GitLab, because other platforms either don't have the concept of user availability (Azure DevOps, Gitea, BitBucket) or have the concept, but don't expose it via their API (GitHub).

Context:

Closes #9348

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[fgreinacher]

From #9348 (comment)

Sounds like a little research/planning on the algorithm is necessary first. e.g. how it interactions with the various other ways we have for picking assignees.

@rarkins Let's use this PR to discuss 😃

[fgreinacher]

Generally I think I'd prefer a generic config option (e.g. filterUsersBasedOnAvailability) over a GitLab-specific one (as suggested in my original issue) to allow adding similar support to other platforms in the future.

[rarkins]

Sure, a single feature but with documentation mentioning which platforms support it would be good. It would be nice if you scan do a quick "scoping" for each platform with this PR to work out which could be supported and which do not have the concept yet.. even if not all are implemented.

[fgreinacher]

It would be nice if you scan do a quick "scoping" for each platform with this PR to work out which could be supported and which do not have the concept yet.. even if not all are implemented.

I updated the description to describe platform support a bit more. Based on that we need to stay with GitLab only for now...

[viceice]

some small changes

[viceice]

@rarkins LGTM

[renovate-release]

🎉 This PR is included in version 25.2.0 🎉

The release is available on:

• GitHub release
• 25.2.0

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