pd-ctl: add notice for member delete

[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)
• v9.0 (TiDB 9.0 versions)
• v8.5 (TiDB 8.5 versions)
• v8.4 (TiDB 8.4 versions)
• v8.3 (TiDB 8.3 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)

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

• This PR is translated from:
• Other reference link(s): pd-ctl member delete 提醒不要在生产环境使用 #20641

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]

[LGTM Timeline notifier]

Timeline:

• 2025-07-10 09:38:57.516887796 +0000 UTC m=+2165390.240066763: ☑️ agreed by Oreoxmt.

[qiancai]

Removed the needs-cherry-pick-release-8.3 label because the v8.3 docs have been archived at https://docs-archive.pingcap.com/zh/tidb/v8.3 and will no longer receive new updates.

[qiancai]

Removed the needs-cherry-pick-release-8.4 label because the v8.4 docs have been archived at https://docs-archive.pingcap.com/zh/tidb/v8.4 and will no longer receive new updates.

[ti-chi-bot]

@bufferflies: adding LGTM is restricted to approvers and reviewers in OWNERS files.

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[Oreoxmt]

/approve

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Oreoxmt

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• OWNERS [Oreoxmt]

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[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.5: #20648.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.1: #20649.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.5: #20650.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.1: #20651.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.5: #20652.