add the removal reason for tidb_enable_change_multi_schema

[qiancai]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-11-28 09:41:39.718194762 +0000 UTC m=+715887.337849275: ☑️ agreed by tangenta.

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[qiancai]

/approve

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[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.5: #19170.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.1: #19171.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.5: #19172.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.1: #19173.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.4: #19174.