chore: delete needless command filed in job `pull-tichi-validate-prow-yaml`

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• zuo-bot-1

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.

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[github-actions[bot]]

🎊 PR Preview 7c89110b1071bfdea4c6b2dc1ac85b7680fc7a9f has been successfully built and deployed to https://ti-community-infra-tichi-preview-pr-1059.surge.sh

:clock1: Build time: 0.011s

_{🤖 By surge-preview}

[codecov[bot]]

Codecov Report

Merging #1059 (7c89110) into master (5c947ab) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1059   +/-   ##
=======================================
  Coverage   80.51%   80.51%           
=======================================
  Files          21       21           
  Lines        3321     3321           
=======================================
  Hits         2674     2674           
  Misses        418      418           
  Partials      229      229           

:mega: We’re building smart automated test selection to slash your CI/CD build times. Learn more

[ghost]

/merge

[ti-chi-bot]

@zuo-bot-1: /merge is only allowed for the committers, you can assign this pull request to the committer in list by filling /assign @committer in the comment to help merge this pull request.

In response to [this](https://github.com/ti-community-infra/tichi/pull/1059#issuecomment-1311609670): >/merge Instructions for interacting with me using PR comments are available [here](https://prow.tidb.net/command-help). If you have questions or suggestions related to my behavior, please file an issue against the [ti-community-infra/tichi](https://github.com/ti-community-infra/tichi/issues/new?title=Prow%20issue:) repository.

[wuhuizuo]

/merge

[ti-chi-bot]

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

Commit hash: 7c89110b1071bfdea4c6b2dc1ac85b7680fc7a9f