cluster: check active before reload promtheus when scale-in/scale-out

[nexustar]

What problem does this PR solve?

• close tiup cluster: scale-in stopped prometheus failed #1770

What is changed and how it works?

Check List

Tests

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

Code changes

• Has exported function/method change
• Has exported variable/fields change
• Has interface methods change
• Has persistent data change

Side effects

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

Related changes

• Need to cherry-pick to the release branch
• Need to update the documentation

Release notes:

NONE

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• srstack

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[codecov-commenter]

Codecov Report

Merging #1775 (75644e6) into master (82c3791) will decrease coverage by 12.43%.
The diff coverage is 93.75%.

❗ Current head 75644e6 differs from pull request most recent head 403995c. Consider uploading reports for the commit 403995c to get more accurate results

@@             Coverage Diff             @@
##           master    #1775       +/-   ##
===========================================
- Coverage   53.14%   40.70%   -12.43%     
===========================================
  Files         303      302        -1     
  Lines       34436    34431        -5     
===========================================
- Hits        18298    14014     -4284     
- Misses      13986    18527     +4541     
+ Partials     2152     1890      -262     

Flag	Coverage Δ
cluster	32.04% <93.75%> (-9.30%)	⬇️
dm	23.39% <93.75%> (-1.49%)	⬇️
unittest	?

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
pkg/cluster/manager/check.go	0.68% <0.00%> (-67.63%)	⬇️
pkg/cluster/manager/destroy.go	49.14% <ø> (-3.45%)	⬇️
pkg/cluster/manager/builder.go	70.65% <100.00%> (-2.10%)	⬇️
pkg/cluster/manager/scale_in.go	48.81% <100.00%> (ø)
pkg/cluster/module/systemd.go	73.17% <100.00%> (+2.90%)	⬆️
pkg/cluster/task/builder.go	75.77% <100.00%> (-24.23%)	⬇️
pkg/cluster/task/systemd.go	63.64% <100.00%> (+1.73%)	⬆️
components/dm/ansible/worker.go	0.00% <0.00%> (-100.00%)	⬇️
pkg/cluster/template/config/config.go	0.00% <0.00%> (-100.00%)	⬇️
pkg/cluster/template/scripts/scripts.go	0.00% <0.00%> (-100.00%)	⬇️
... and 126 more

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[srstack]

/merge

[ti-chi-bot]

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

Commit hash: b559b46