metric: fix wrong total-query-counter label (#25402)

[ti-srebot]

cherry-pick #25402 to release-5.1
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# In tidb repo:
git pr https://github.com/pingcap/tidb/pull/25446

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---

What problem does this PR solve?

Problem Summary:

there are two label ERROR and Error for total query counter which make user confused

What is changed and how it works?

Proposal: xxx

What's Changed, How it Works:

make them use Error instead of ERROR

Related changes

• Need to cherry-pick to the release branch

Check List

Tests

• No code

Side effects

• n/a

Release note

• No release note

[ti-srebot]

/run-all-tests

[ti-srebot]

@lysu you're already a collaborator in bot's repo.

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• breeswish
• xhebox

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[zhouqiang-cl]

/merge

[ti-chi-bot]

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

Commit hash: 588e966

[ti-chi-bot]

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