Specify extra store labels by param --labels (#420) (release-8.5)

[JaySon-Huang]

cherry-pick of #420

ref pingcap/tiflash#9750

• Remove param --engine-role-label
• Specify extra store labels by param --labels
  • If there are duplicated key in server.labels and --labels, use the one in server.labels

What is changed and how it works?

Issue Number: Close #xxx

What's Changed:

Related changes

• PR to update pingcap/docs/pingcap/docs-cn:
• Need to cherry-pick to the release branch

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Release note

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[JaySon-Huang]

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[JaySon-Huang]

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[JaySon-Huang]

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