feat(cherrypicker): add target branch info in comment when pull request created

[wuhuizuo]

What

• add target branch in response comment.

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• purelind

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[github-actions[bot]]

🎊 PR Preview a0bff9a15d1fe743a50faba2ab8db6b694246b0c has been successfully built and deployed to https://ti-community-infra-tichi-preview-pr-1052.surge.sh

:clock1: Build time: 0.009s

_{🤖 By surge-preview}

[wuhuizuo]

/cc @busyjay

[ti-chi-bot]

@wuhuizuo: GitHub didn't allow me to request PR reviews from the following users: busyjay.

Note that only ti-community-infra members and repo collaborators can review this PR, and authors cannot review their own PRs.

In response to [this](https://github.com/ti-community-infra/tichi/pull/1052#issuecomment-1282118718): >/cc @busyjay Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/guide/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes/test-infra](https://github.com/kubernetes/test-infra/issues/new?title=Prow%20issue:) repository.

[codecov[bot]]

Codecov Report

Merging #1052 (a0bff9a) into master (9f441f2) will not change coverage. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #1052   +/-   ##
=======================================
  Coverage   80.51%   80.51%           
=======================================
  Files          21       21           
  Lines        3321     3321           
=======================================
  Hits         2674     2674           
  Misses        418      418           
  Partials      229      229           

Impacted Files	Coverage Δ
...l/pkg/externalplugins/cherrypicker/cherrypicker.go	62.09% <100.00%> (ø)

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[wuhuizuo]

/uncc zuo-bot-2

[wuhuizuo]

/merge

[ti-chi-bot]

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

Commit hash: a0bff9a15d1fe743a50faba2ab8db6b694246b0c