pd: GA active follower

[okJiang]

First-time contributors' checklist

• I've signed Contributor License Agreement that's required for repo owners to accept my contribution.

What is changed, added or deleted? (Required)

Which TiDB version(s) do your changes apply to? (Required)

Tips for choosing the affected version(s):

By default, CHOOSE MASTER ONLY so your changes will be applied to the next TiDB major or minor releases. If your PR involves a product feature behavior change or a compatibility change, CHOOSE THE AFFECTED RELEASE BRANCH(ES) AND MASTER.

For details, see tips for choosing the affected versions (in Chinese).

• master (the latest development version)
• v8.5 (TiDB 8.5 versions)
• v8.4 (TiDB 8.4 versions)
• v8.3 (TiDB 8.3 versions)
• v8.2 (TiDB 8.2 versions)
• v8.1 (TiDB 8.1 versions)
• v7.5 (TiDB 7.5 versions)
• v7.1 (TiDB 7.1 versions)
• v6.5 (TiDB 6.5 versions)
• v6.1 (TiDB 6.1 versions)
• v5.4 (TiDB 5.4 versions)
• v5.3 (TiDB 5.3 versions)

What is the related PR or file link(s)?

• This PR is translated from:
• Other reference link(s): Activate Follower-Handle tikv/pd#7431

Do your changes match any of the following descriptions?

• Delete files
• Change aliases
• Need modification after applied to another branch
• Might cause conflicts after applied to another branch

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[ti-chi-bot]

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[Oreoxmt]

/remove-label missing-translation-status

[ti-chi-bot]

@Oreoxmt: The label(s) missing-translation-status cannot be applied. These labels are supported: 2024-tidb-docs-dash, contribution, first-time-contributor, for-future-release, good first issue, hacktoberfest-accepted, Hacktoberfest, help wanted, needs-cherry-pick-master, needs-cherry-pick-release-5.4, needs-cherry-pick-release-6.1, needs-cherry-pick-release-6.5, needs-cherry-pick-release-7.1, needs-cherry-pick-release-7.5, needs-cherry-pick-release-8.1, needs-cherry-pick-release-8.5, needs-cherry-pick-release-8.2, needs-cherry-pick-release-8.3, needs-cherry-pick-release-8.4, question, requires-followup, requires-version-specific-changes, special-week, website.

In response to this:

/remove-label missing-translation-status

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-11-13 09:19:02.43431775 +0000 UTC m=+434304.625186747: ☑️ agreed by Oreoxmt.