cluster: deduplicate the check result

[srstack]

What problem does this PR solve?

close #1724

What is changed and how it works?

Use SetString to remove duplicate messages

Check List

Tests

• Manual test (add detailed scripts or steps below)
  Code changes

Side effects

Related changes

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 #1737 (e626e28) into master (d2e2b40) will increase coverage by 21.15%.
The diff coverage is 93.10%.

❗ Current head e626e28 differs from pull request most recent head 23ebb9e. Consider uploading reports for the commit 23ebb9e to get more accurate results

@@             Coverage Diff             @@
##           master    #1737       +/-   ##
===========================================
+ Coverage   24.43%   45.58%   +21.15%     
===========================================
  Files         277      303       +26     
  Lines       31461    34353     +2892     
===========================================
+ Hits         7686    15659     +7973     
+ Misses      22923    16831     -6092     
- Partials      852     1863     +1011     

Flag	Coverage Δ
cluster	28.96% <0.00%> (?)
dm	24.72% <0.00%> (?)
playground	12.73% <ø> (?)
tiup	14.53% <ø> (-0.02%)	⬇️
unittest	21.40% <93.10%> (+0.07%)	⬆️

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

Impacted Files	Coverage Δ
pkg/cluster/manager/check.go	5.28% <93.10%> (+5.28%)	⬆️
pkg/repository/store/txn.go	56.91% <0.00%> (-2.13%)	⬇️
pkg/logger/debug.go	16.67% <0.00%> (ø)
components/playground/instance/process.go	81.97% <0.00%> (ø)
components/playground/instance/tikv.go	63.24% <0.00%> (ø)
components/playground/instance/tikv_config.go	100.00% <0.00%> (ø)
pkg/cluster/operation/pd_member.go	0.00% <0.00%> (ø)
components/dm/task/update_dm_meta.go	87.76% <0.00%> (ø)
components/playground/instance/ticdc.go	0.00% <0.00%> (ø)
pkg/cluster/operation/download.go	33.33% <0.00%> (ø)
... and 186 more

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[AstroProfundis]

/merge

[ti-chi-bot]

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

Commit hash: 23ebb9e