ctl: replace gc_safepoint call with HTTP SDK

[JackL9u]

What problem does this PR solve?

Issue Number: Ref #7300

What is changed and how does it work?

replace doRequest(..) call with HTTP SDK

[ti-chi-bot]

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[ti-chi-bot]

Hi @JackL9u. Thanks for your PR.

I'm waiting for a tikv member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[ti-chi-bot]

Thanks for your pull request. Before we can look at it, you'll need to add a 'DCO signoff' to your commits.

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The list of commits missing DCO signoff:

• 3d48ee0 Merge branch 'dev' of https://github.com/JackL9u/pd into dev
• af75cc7 Merge branch 'tikv:master' into dev
• 0c2f082 Merge remote-tracking branch 'upstream/master' into dev
• b0fd0f3 Merge branch 'dev' of https://github.com/JackL9u/pd into dev

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 kubernetes/test-infra repository. I understand the commands that are listed here.