grafana: fix lightning's name not changed when cluster renamed

[9547]

What problem does this PR solve?

fix #1166

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

[codecov-io]

Codecov Report

Merging #1196 (acca1da) into master (1a8d77a) will increase coverage by 1.95%.
The diff coverage is 33.33%.

@@            Coverage Diff             @@
##           master    #1196      +/-   ##
==========================================
+ Coverage   31.50%   33.46%   +1.95%     
==========================================
  Files         295      254      -41     
  Lines       35249    17659   -17590     
==========================================
- Hits        11106     5909    -5197     
+ Misses      22421    10691   -11730     
+ Partials     1722     1059     -663     

Flag	Coverage Δ
cluster	27.25% <0.00%> (-17.68%)	⬇️
dm	25.52% <33.33%> (+11.66%)	⬆️
integrate	33.46% <33.33%> (+5.25%)	⬆️
playground	?
tiup	?
unittest	?

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

Impacted Files	Coverage Δ
pkg/cluster/api/binlog.go	0.00% <0.00%> (-39.48%)	⬇️
pkg/cluster/manager/display.go	63.38% <0.00%> (-19.13%)	⬇️
pkg/cluster/spec/validate.go	56.18% <ø> (-37.33%)	⬇️
pkg/cluster/spec/grafana.go	68.46% <100.00%> (-0.29%)	⬇️
pkg/repository/store/store.go	0.00% <0.00%> (-100.00%)	⬇️
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%)	⬇️
pkg/repository/utils/hash.go	0.00% <0.00%> (-81.82%)	⬇️
pkg/meta/err.go	0.00% <0.00%> (-81.25%)	⬇️
... and 177 more

---

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[9547]

@lucklove PTAL

[lucklove]

/lgtm

[ti-chi-bot]

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• lucklove

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[lucklove]

/merge

[ti-chi-bot]

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

Commit hash: acca1da