mcs: force load when rule watcher meet error

[lhy1024]

What problem does this PR solve?

Issue Number: Close #xxx

What is changed and how does it work?

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Code changes

• Has the configuration change
• Has HTTP API interfaces changed (Don't forget to add the declarative for the new API)
• Has persistent data change

Side effects

• Possible performance regression
• Increased code complexity
• Breaking backward compatibility

Related changes

• PR to update pingcap/docs/pingcap/docs-cn:
• PR to update pingcap/tiup:
• Need to cherry-pick to the release branch

Release note

None.

[ti-chi-bot[bot]]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• rleungx

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[codecov[bot]]

Codecov Report

Merging #7607 (36da56e) into master (754095a) will decrease coverage by 0.06%. Report is 54 commits behind head on master. The diff coverage is 50.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #7607      +/-   ##
==========================================
- Coverage   73.87%   73.81%   -0.06%     
==========================================
  Files         429      429              
  Lines       47376    47391      +15     
==========================================
- Hits        35000    34984      -16     
- Misses       9392     9415      +23     
- Partials     2984     2992       +8     

Flag	Coverage Δ
unittests	73.81% <50.00%> (-0.06%)	:arrow_down:

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[CabinfeverB]

Issue Number?

[ti-chi-bot[bot]]

[FORMAT CHECKER NOTIFICATION]

Notice: To remove the do-not-merge/needs-linked-issue label, please provide the linked issue number on one line in the PR body, for example: Issue Number: close #123 or Issue Number: ref #456, multiple issues should use full syntax for each issue and be separated by a comma, like: Issue Number: close #123, ref #456.

_{:open_book: For more info, you can check the "Linking issues" section in the CONTRIBUTING.md.}

[ti-chi-bot[bot]]

PR needs rebase.

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