planner: forbid [batch] point get with update read choose tiflash as datasource (#39553)

[ti-chi-bot]

This is an automated cherry-pick of #39553

What problem does this PR solve?

Issue Number: close #39543

Problem Summary:

What is changed and how it works?

forbid [batch] point get with update read choose tiflash as datasource

Check List

Tests

• Unit test

Release note

Please refer to Release Notes Language Style Guide to write a quality release note.

None

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• Yisaer
• xuyifangreeneyes

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[Yisaer]

/merge

[ti-chi-bot]

@Yisaer: /merge in this pull request requires 2 approval(s).

In response to this:

/merge

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[Yisaer]

/merge

[ti-chi-bot]

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

Commit hash: 73fe3a8