Etcd (ticdc, dm):add AutoSyncInterval for Etcd client (#8813)

[ti-chi-bot]

This is an automated cherry-pick of #8813

What problem does this PR solve?

Issue Number: close #8812

What is changed and how it works?

Check List

Tests

• Manual test (add detailed scripts or steps below)

Questions

Will it cause performance regression or break compatibility?

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

Release note

Fix a bug that causes TiCDC to be stuck or restart when PD scale in after scale out.

[ti-chi-bot]

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[ti-chi-bot]

@ti-chi-bot: The following test 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	3660970	link	true	/test verify

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[asddongmen]

This cherry-pick is contained in #8901.

[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.

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