planner: fixing wrong result after applying predicate push down for CTEs (#47891)

[ti-chi-bot]

This is an automated cherry-pick of #47891

What problem does this PR solve?

Issue Number: close #47881

Problem Summary:

What is changed and how it works?

The outerMost should be prop of the CTE itself, not the CTE reader's.

Check List

Tests

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

  • I checked and no code files have been changed.

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

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

Fix the issue that TiDB may push wrong predicates into the CTE.

[winoros]

/retest

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (release-6.5@b7f909c). Click here to learn what that means.
The diff coverage is n/a.

Additional details and impacted files

@@               Coverage Diff                @@
##             release-6.5     #48192   +/-   ##
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  Coverage               ?   73.8910%           
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  Files                  ?       1087           
  Lines                  ?     351650           
  Branches               ?          0           
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  Hits                   ?     259838           
  Misses                 ?      75374           
  Partials               ?      16438           

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: AilinKid, time-and-fate

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2023-11-24 06:29:09.65876154 +0000 UTC m=+558578.323987738: ☑️ agreed by time-and-fate.
• 2023-11-24 06:31:17.801631946 +0000 UTC m=+558706.466858164: ☑️ agreed by AilinKid.

[winoros]

/retest