etcd/client(ticdc): add retry operation for etcd transaction api (#4248) (#4474)

[ti-chi-bot]

This is an automated cherry-pick of #4474

What problem does this PR solve?

Issue Number: close #4248

What is changed and how it works?

1. Add retry strategy for etcd transaction, which uniformly handles errors related to etcd transactions and only throws errors that are not retryable, such as context.Canceled, context.DeadlineExceeded, errors.ErrReachMaxTry.
2. Catch all of the EtcdError in the etcd_worker and retry the Txn operation again to prevent the cdc process from exiting abnormally.
3. When the connection between cdc and etcd is abnormal, session will be responsible for disconnecting and throwing ErrEtcdSessionDone error, which causes the capture to automatically recover after suicide.

Check List

Tests

• Unit test

Code changes

• Has exported function/method change
• Has exported variable/fields change

Side effects

• Possible performance regression
• Increased code complexity

Related changes

• Need to cherry-pick to the release branch

Release note

Fix a bug that owner exits abnormally when PD leader is killed

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has not been approved.

To complete the pull request process, please ask the reviewers in the list to review by filling /cc @reviewer in the comment.
After your PR has acquired the required number of LGTMs, you can assign this pull request to the committer in the list by filling /assign @committer in the comment to help you merge this pull request.

The full list of commands accepted by this bot can be found here.

Reviewer can indicate their review by submitting an approval review.
Reviewer can cancel approval by submitting a request changes review.

[ti-chi-bot]

@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.

To merge this cherry pick, it must first be approved by the collaborators.

AFTER it has been approved by collaborators, please ping the release team in a comment to request a cherry pick review.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[VelocityLight]

This pull request is closed because it's related version has closed automatic cherry-picking.
If it's still needed, you can reopen it or just regenerate it using bot,
see:

• https://prow.tidb.io/command-help#cherrypick
• https://book.prow.tidb.net/#/plugins/cherrypicker

You can find more details at:

• https://internals.tidb.io/t/topic/785