planner: fix primary index hint when isolation read engine is tiflash

[lilinghai]

What problem does this PR solve?

Issue Number: close #61231

Problem Summary:

What changed and how does it work?

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.

None

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.6709%. Comparing base (51659f3) to head (751e330).
Report is 5 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #61234        +/-   ##
================================================
+ Coverage   73.1386%   73.6709%   +0.5322%     
================================================
  Files          1726       1726                
  Lines        478048     480709      +2661     
================================================
+ Hits         349638     354143      +4505     
+ Misses       106960     105100      -1860     
- Partials      21450      21466        +16     

Flag	Coverage Δ
integration	42.9319% <100.0000%> (?)
unit	72.4132% <100.0000%> (+0.0383%)	⬆️

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Components	Coverage Δ
dumpling	52.7804% <ø> (ø)
parser	∅ <ø> (∅)
br	47.5969% <ø> (+0.0218%)	⬆️

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