operator: remove cancel reason for successfully finishing operator

[rleungx]

What problem does this PR solve?

Issue Number: Close #4399

What is changed and how does it work?

Check List

Tests

• Unit test

Release note

None.

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• bufferflies
• nolouch

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[codecov]

Codecov Report

Merging #7019 (5625b8e) into master (a7353bb) will decrease coverage by 0.08%.
Report is 3 commits behind head on master.
The diff coverage is 100.00%.

❗ Current head 5625b8e differs from pull request most recent head 3ace0cb. Consider uploading reports for the commit 3ace0cb to get more accurate results

@@            Coverage Diff             @@
##           master    #7019      +/-   ##
==========================================
- Coverage   74.22%   74.15%   -0.08%     
==========================================
  Files         433      433              
  Lines       46139    46099      -40     
==========================================
- Hits        34247    34185      -62     
- Misses       8876     8892      +16     
- Partials     3016     3022       +6     

Flag	Coverage Δ
unittests	74.15% <100.00%> (-0.08%)	⬇️

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[nolouch]

/merge

[ti-chi-bot]

@nolouch: It seems you want to merge this PR, I will help you trigger all the tests:

/run-all-tests

You only need to trigger /merge once, and 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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[ti-chi-bot]

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

Commit hash: 5625b8e

[ti-chi-bot]

@rleungx: Your PR was out of date, I have automatically updated it for you.

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.