Add observability for ALTER TABLE ... COMPACT

[shichun-0415]

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• This PR is translated from: Add observability for ALTER TABLE ... COMPACT docs-cn#10470
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[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• Oreoxmt
• breezewish

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[breezewish]

Thanks a lot! Only some minor suggestions.

[Oreoxmt]

Rest LGTM

[shichun-0415]

/merge

[ti-chi-bot]

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

Commit hash: cb7021d

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.1: #11713.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.2: #11714.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.3: #11715.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.4: #11716.