fix: Trusted server icon recovery without addressbook change

[pabzm]

Summary

Always set server status to OK after successful runs

Previously if a server status got set to failure, it stayed that way
until an addressbook-sync found changes. Now the server status is set to
OK after each successful sync check (if that's not the case already),
regardless of addressbook changes.

Additionally a log warning was added in two places where the server status gets set to failure when a job gets removed due to being too old. This would've helped in debugging a problem, so now there's a logging hint for next time.

Checklist

• Code is properly formatted
• Sign-off message is added to all commits
• Tests (unit, integration, api and/or acceptance) are included
• Screenshots before/after for front-end changes
• Documentation (manuals or wiki) has been updated or is not required
• Backports requested where applicable (ex: critical bugfixes)

[pabzm]

This is my first PR in this repo, I'm a little unsure about some details (e.g. those checkboxes). Please let me know if there's something I should change or do.

[ChristophWurst]

/backport to stable30

[ChristophWurst]

/backport to stable29

[ChristophWurst]

/backport to stable28

[welcome]

Thanks for your first pull request and welcome to the community! Feel free to keep them coming! If you are looking for issues to tackle then have a look at this selection: https://github.com/nextcloud/server/issues?q=is%3Aopen+is%3Aissue+label%3A%22good+first+issue%22

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