fix: cluster prune will destroy pump/drainer directly after scale-in

[srstack]

What problem does this PR solve?

close #1850

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:

• AstroProfundis

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[codecov-commenter]

Codecov Report

Merging #1851 (aa88c70) into master (e5b8861) will increase coverage by 0.01%.
The diff coverage is 50.00%.

@@            Coverage Diff             @@
##           master    #1851      +/-   ##
==========================================
+ Coverage   52.52%   52.53%   +0.01%     
==========================================
  Files         306      306              
  Lines       34986    34986              
==========================================
+ Hits        18374    18379       +5     
+ Misses      14449    14439      -10     
- Partials     2163     2168       +5     

Flag	Coverage Δ
cluster	40.84% <50.00%> (+0.02%)	⬆️
dm	24.55% <0.00%> (ø)
playground	12.79% <ø> (ø)
tiup	14.44% <ø> (ø)
unittest	21.26% <ø> (ø)

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

Impacted Files	Coverage Δ
pkg/cluster/operation/destroy.go	60.08% <50.00%> (ø)
pkg/cluster/task/update_meta.go	84.95% <0.00%> (-2.15%)	⬇️
pkg/cluster/api/pdapi.go	57.47% <0.00%> (-1.05%)	⬇️
pkg/cluster/spec/tikv.go	62.62% <0.00%> (+1.31%)	⬆️
pkg/utils/retry.go	62.50% <0.00%> (+16.07%)	⬆️

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[AstroProfundis]

/merge

[ti-chi-bot]

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

Commit hash: aa88c70