Improve usage of IMPORT FROM SELECT

[hfxsd]

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What is changed, added or deleted? (Required)

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• v9.0 (TiDB 9.0 versions)
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What is the related PR or file link(s)?

• This PR is translated from:Improve usage of IMPORT FROM SELECT docs-cn#19261
• Other reference link(s):

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]

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[lilin90]

/lgtm

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-12-24 02:39:07.535550697 +0000 UTC m=+1529337.624353235: ☑️ agreed by lance6716.
• 2024-12-24 03:33:12.045776933 +0000 UTC m=+1532582.134579475: ☑️ agreed by lilin90.

[hfxsd]

/approve

[ti-chi-bot]

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[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.5: #19779.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.1: #19780.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.5: #19781.