metrics: correct TiKV CDC endpoint CPU (#1640)

[ti-srebot]

cherry-pick #1640 to release-5.0
You can switch your code base to this Pull Request by using git-extras:

# In ticdc repo:
git pr https://github.com/pingcap/ticdc/pull/1645

After apply modifications, you can push your change to this PR via:

git push [email protected]:ti-srebot/ticdc.git pr/1645:release-5.0-1b43ffbdc40c

---

What problem does this PR solve?

Corrects TiKV CDC endpoint CPU

Check List

Tests

• No code

Related changes

• Need to cherry-pick to the release branch

Release note

• Correct TiKV CDC endpoint CPU metric in TiCDC dashboard.

[ti-srebot]

/run-all-tests

[overvenus]

/lgtm

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• amyangfei
• overvenus

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[overvenus]

/merge

[ti-chi-bot]

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

Commit hash: 469c71c

[amyangfei]

/run-kafka-tests

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (release-5.0@1ae0c69). Click here to learn what that means.
The diff coverage is n/a.

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[amyangfei]

/run-integration-tests

[ti-chi-bot]

@ti-srebot: Your PR was out of date, I have automatically updated it for you.

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/run-all-tests

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