cluster: print more clear warning when scale in with --force

[AstroProfundis]

What problem does this PR solve?

Close #1453

Related changes

• Need to cherry-pick to the release branch

Release notes:

NONE

[lucklove]

LGTM

[ti-chi-bot]

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• lucklove

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[AstroProfundis]

/merge

[ti-chi-bot]

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

Details

Commit hash: 9f44afc

[codecov-commenter]

Codecov Report

Merging #1477 (89dedd5) into master (35998e0) will increase coverage by 6.28%.
The diff coverage is 33.33%.

❗ Current head 89dedd5 differs from pull request most recent head 4ff240f. Consider uploading reports for the commit 4ff240f to get more accurate results

@@            Coverage Diff             @@
##           master    #1477      +/-   ##
==========================================
+ Coverage   26.27%   32.56%   +6.28%     
==========================================
  Files         267      228      -39     
  Lines       23784    20745    -3039     
==========================================
+ Hits         6249     6755     +506     
+ Misses      16714    12961    -3753     
- Partials      821     1029     +208     

Flag	Coverage Δ
cluster	32.56% <33.33%> (?)
integrate	32.56% <33.33%> (+16.39%)	⬆️
tiup	?
unittest	?

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

Impacted Files	Coverage Δ
pkg/cluster/manager/scale_in.go	51.92% <33.33%> (+51.92%)	⬆️
pkg/utils/regexp.go	0.00% <0.00%> (-100.00%)	⬇️
pkg/repository/store/store.go	0.00% <0.00%> (-100.00%)	⬇️
pkg/telemetry/telemetry.go	0.00% <0.00%> (-83.34%)	⬇️
pkg/repository/utils/hash.go	0.00% <0.00%> (-83.34%)	⬇️
pkg/repository/model/publish.go	0.00% <0.00%> (-83.34%)	⬇️
pkg/utils/diff.go	0.00% <0.00%> (-83.15%)	⬇️
pkg/repository/store/local.go	0.00% <0.00%> (-82.61%)	⬇️
pkg/utils/semver.go	5.51% <0.00%> (-81.11%)	⬇️
pkg/meta/err.go	0.00% <0.00%> (-77.78%)	⬇️
... and 221 more

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