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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[asddongmen]

/merge

[ti-chi-bot]

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

Commit hash: 470d826

[asddongmen]

/test all

[asddongmen]

/run-all-tests

[ti-chi-bot]

@ti-chi-bot: Your PR was out of date, I have automatically updated it for you.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

trigger some heavy tests which will not run always when PR updated.

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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[asddongmen]

/retest

[asddongmen]

/run-integration-test