cluster: add GetClusterID() in pdapi

[nexustar]

What problem does this PR solve?

cluster: add GetClusterID() in pdapi

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 #1573 (052f8b2) into master (0295c07) will increase coverage by 30.09%.
The diff coverage is 0.00%.

@@             Coverage Diff             @@
##           master    #1573       +/-   ##
===========================================
+ Coverage   26.18%   56.28%   +30.09%     
===========================================
  Files         266      291       +25     
  Lines       24052    26237     +2185     
===========================================
+ Hits         6299    14768     +8469     
+ Misses      16930     9447     -7483     
- Partials      823     2022     +1199     

Flag	Coverage Δ
cluster	44.06% <0.00%> (?)
dm	26.30% <0.00%> (?)
integrate	50.91% <0.00%> (+35.11%)	⬆️
playground	13.52% <0.00%> (?)
tiup	15.79% <0.00%> (-0.02%)	⬇️
unittest	22.72% <0.00%> (-0.02%)	⬇️

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

Impacted Files	Coverage Δ
pkg/cluster/api/pdapi.go	59.05% <0.00%> (+59.05%)	⬆️
...onents/playground/instance/tiflash_proxy_config.go	83.33% <0.00%> (ø)
pkg/logger/debug.go	20.00% <0.00%> (ø)
components/playground/instance/tikv.go	67.85% <0.00%> (ø)
components/playground/instance/instance.go	51.72% <0.00%> (ø)
pkg/cluster/operation/destroy.go	59.88% <0.00%> (ø)
pkg/cluster/operation/systemd.go	75.00% <0.00%> (ø)
pkg/cluster/operation/action.go	63.89% <0.00%> (ø)
pkg/cluster/operation/scale_in.go	60.22% <0.00%> (ø)
components/playground/instance/pump.go	0.00% <0.00%> (ø)
... and 213 more

---

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[AstroProfundis]

/merge

[ti-chi-bot]

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

Commit hash: 052f8b2