tests(ticdc): Migrate test cases to testify for pkg/etcd

[zhaoxinyu]

What problem does this PR solve?

Issue Number: close #2878

What is changed and how it works?

Migrate all test cases under pkg/etcd to testify.

Check List

Tests

• Unit test

Release note

None

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• overvenus

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[codecov-commenter]

Codecov Report

Merging #4219 (93444d8) into master (08da001) will decrease coverage by 0.0020%.
The diff coverage is 52.6219%.

Flag	Coverage Δ
cdc	58.5470% <56.7291%> (-0.0978%)	⬇️
dm	52.2666% <42.2746%> (+0.0120%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

@@               Coverage Diff                @@
##             master      #4219        +/-   ##
================================================
- Coverage   55.1722%   55.1701%   -0.0021%     
================================================
  Files           485        488         +3     
  Lines         59829      60801       +972     
================================================
+ Hits          33009      33544       +535     
- Misses        23484      23874       +390     
- Partials       3336       3383        +47     

[overvenus]

/merge

[ti-chi-bot]

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

Commit hash: 187ff11

[overvenus]

/merge

[ti-chi-bot]

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

Commit hash: 93444d8

[ti-chi-bot]

@zhaoxinyu: Your PR was out of date, I have automatically updated it for you.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

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.

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 ti-community-infra/tichi repository.