etcd_worker: add timeout for etcd txn and watchCh (#3667)

[ti-chi-bot]

This is an automated cherry-pick of #3667

What problem does this PR solve?

#3615

What is changed and how it works?

Check List

Tests

• Unit test.

Code changes

Side effects

Related changes

• Need to cherry-pick to the release branch

Release note

Try to fix owner stuck caused by etcd txn timeout or etcd watch channel blocked in EtcdWorker. 

[ti-chi-bot]

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[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.

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[asddongmen]

All change in this PR is included in #3392.