metrics(ticdc): fix min resolved ts/checkpoint table ID metrics

[overvenus]

What problem does this PR solve?

Issue Number: close #4374

What is changed and how it works?

Remove avg.

Check List

Tests

• Manual test (add detailed scripts or steps below)

Release note

Fix min resolved ts/checkpoint table ID metrics

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• hi-rustin
• sdojjy

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[codecov-commenter]

Codecov Report

Merging #4375 (22ecb75) into master (ab62e6b) will decrease coverage by 0.1449%.
The diff coverage is 48.6885%.

Flag	Coverage Δ
cdc	59.2555% <54.6042%> (-0.3604%)	⬇️
dm	52.1091% <45.6647%> (+0.0435%)	⬆️

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

@@               Coverage Diff                @@
##             master      #4375        +/-   ##
================================================
- Coverage   55.5183%   55.3733%   -0.1450%     
================================================
  Files           495        495                
  Lines         61151      61051       -100     
================================================
- Hits          33950      33806       -144     
- Misses        23789      23838        +49     
+ Partials       3412       3407         -5     

[Rustin170506]

/merge

[ti-chi-bot]

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

Commit hash: 22ecb75

[ti-chi-bot]

@overvenus: Your PR was out of date, I have automatically updated it for you.

At the same time I will also trigger all tests for you:

/run-all-tests

If the CI test fails, you just re-trigger the test that failed and the bot will merge the PR for you after the CI passes.

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[ti-chi-bot]

In response to a cherrypick label: new pull request created: #4377.