*: fix changefeed checkpoint lag negative value error (#3013)

[ti-chi-bot]

This is an automated cherry-pick of #3013

What problem does this PR solve?

Close #3010

What is changed and how it works?

Check List

Tests

• Manual test (add detailed scripts or steps below)
• Unit test

Code changes

• Has exported function/method change
• Has exported variable/fields change

Side effects

• Possible performance regression
• Increased code complexity

Related changes

• Need to cherry-pick to the release branch

Release note

fix changefeed checkpoint lag negative value error

[ti-chi-bot]

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[codecov-commenter]

Codecov Report

❗ No coverage uploaded for pull request base (release-5.3@eeb9e7b). Click here to learn what that means.
The diff coverage is n/a.

❗ Current head 27baeae differs from pull request most recent head de73c94. Consider uploading reports for the commit de73c94 to get more accurate results

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[amyangfei]

/merge

[ti-chi-bot]

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

Commit hash: 27baeae