etcd (ticdc): add grpc keepalive params and add timeout for check pd version ctx. (#9106)

[ti-chi-bot]

This is an automated cherry-pick of #9106

What problem does this PR solve?

Issue Number: close #8808

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 cdc hang when pd leader network partitioned.

[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	a095c39	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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