metrics(ticdc): fix EtcdWorker row (#3993)

[ti-chi-bot]

This is an automated cherry-pick of #3993

What problem does this PR solve?

Fix borken EtcdWorker row.

master	this PR

Check List

Tests

• Manual test (add detailed scripts or steps below)
  Import ticdc.json

Related changes

• Need to cherry-pick to the release branch

Release note

None (not released yet)

[ti-chi-bot]

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[ti-chi-bot]

@ti-chi-bot: This cherry pick PR is for a release branch and has not yet been approved by release team.
Adding the do-not-merge/cherry-pick-not-approved label.

To merge this cherry pick, it must first be approved by the collaborators.

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[codecov-commenter]

Codecov Report

❗ No coverage uploaded for pull request base (release-5.1@345dbb5). Click here to learn what that means.
The diff coverage is n/a.

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[overvenus]

/hold