cdc: log slow conflict detect every 60s (#11251)

[ti-chi-bot]

This is an automated cherry-pick of #11251

What problem does this PR solve?

Issue Number: close #11271

What is changed and how it works?

Log slow conflict detect every 60s.

Check List

Tests

• No code

Questions

Will it cause performance regression or break compatibility?

Do you need to update user documentation, design documentation or monitoring documentation?

Release note

None

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[ti-chi-bot]

@ti-chi-bot: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
jenkins-ticdc/verify	93e07f2	link	true	/test verify
pull-cdc-integration-mysql-test	93e07f2	link	true	/test cdc-integration-mysql-test
pull-cdc-integration-pulsar-test	93e07f2	link	true	/test cdc-integration-pulsar-test
pull-cdc-integration-kafka-test	93e07f2	link	true	/test cdc-integration-kafka-test
pull-cdc-integration-storage-test	93e07f2	link	true	/test cdc-integration-storage-test

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[ti-chi-bot]

PR needs rebase.

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[hicqu]

Code base conflicts with release-7.5 too much. Considering it's just a log, so we can leave it.

[ti-chi-bot]

This cherry pick PR is for a release branch and has not yet been approved by triage owners.
Adding the do-not-merge/cherry-pick-not-approved label.

To merge this cherry pick:

1. It must be approved by the approvers firstly.
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