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

[asddongmen]

What problem does this PR solve?

Issue Number: close #8808

What is changed and how it works?

1. Added two grpc parameters when creating the etcd client (increased fault tolerance)
2. Increased the number of retries for etcdClient api calls (increased fault tolerance)
3. Added a timeout to the ctx for checkPDVersion (prevents hanging)

These are very small changes.

Currently tested 30 times, test results show that the highest delay of changefeed is 5 minutes, the lowest delay is zero, and the average delay is about 1 minute. The cause of the delay is that some cdc nodes will restart capture due to etcd session disconnect, which cannot be avoided; increasing the value of capture-session-ttl can slightly reduce the probability of this happening, but it cannot be completely avoided.

This PR cannot completely solve the problem of cdc delays when pd leader io hang errors are injected. Currently, the test results are quite mysterious, with 5 out of 10 times having issues and 5 times not having issues.

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]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• 3AceShowHand
• sdojjy

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[asddongmen]

/test all

[asddongmen]

/test all

[asddongmen]

/merge

[ti-chi-bot]

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

Commit hash: 2bf6322

[ti-chi-bot]

@asddongmen: Your PR was out of date, I have automatically updated it for you.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]

/test dm-integration-test

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.1: #9117.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.5: #9118.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.1: #9119.