checker: add disconnected check when fix orphan peers (#7240)

[lhy1024]

This is a cherry-pick of #7240

What problem does this PR solve?

Issue Number: Close #7249

What is changed and how does it work?

Check List

Tests

• Unit test

Release note

None.

[ti-chi-bot]

[REVIEW NOTIFICATION]

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• CabinfeverB
• disksing

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[codecov]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Files	Coverage Δ
server/schedule/checker/rule_checker.go	82.58% <75.00%> (-0.21%)	⬇️

... and 16 files with indirect coverage changes

📢 Thoughts on this report? Let us know!.

[disksing]

/merge

[ti-chi-bot]

@disksing: It seems you want to merge this PR, I will help you trigger all the tests:

/run-all-tests

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[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: cf5147f

[ti-chi-bot]

@lhy1024: Your PR was out of date, I have automatically updated it for you.

If the CI test fails, you just re-trigger the test that failed and the bot will merge the PR for you after the CI passes.

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