planner: support tiflash scan in transaction with dirty data

[windtalker]

What problem does this PR solve?

Issue Number: ref #32829

Problem Summary:
This pr reverts commit b0f823c, and support tiflash scan in transaction with dirty data.

What is changed and how it works?

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Documentation

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Changes MySQL compatibility

Release note

None

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• tiancaiamao
• wshwsh12

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[windtalker]

/run-all-tests

[sre-bot]

Please follow PR Title Format:

• pkg [, pkg2, pkg3]: what is changed

Or if the count of mainly changed packages are more than 3, use

• *: what is changed

After you have format title, you can leave a comment /run-check_title to recheck it

[sre-bot]

Code Coverage Details: https://codecov.io/github/pingcap/tidb/commit/d9e7f798b2ee18dbbbdacb3354eff2a8243c7a55

[wshwsh12]

/merge

[ti-chi-bot]

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

Commit hash: bd56459

[ti-chi-bot]

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