server: fix decode issue for prefetch point plan index keys (#50037)

[ti-chi-bot]

This is an automated cherry-pick of #50037

What problem does this PR solve?

Issue Number: close #50012

Problem Summary:

The second parameter of tablecodec.DecodeHandleInUniqueIndexValue indicates whether index KVs belong to a clustered-index table. Previously, it was always false, causing decoding error and panic.

What changed and how does it work?

• Set the parameter properly.
• In order to pass the check like BatchGet req does not set the resource tag, tid: 123, stack: goroutine 20153 [running], I also set the resource group tagger by the digest of all SQLs.
• Add an integration test.

Check List

Tests

• [ ] Unit test
• [x] 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

[ti-chi-bot[bot]]

[LGTM Timeline notifier]

Timeline:

• 2024-02-26 08:21:23.794715459 +0000 UTC m=+863772.542338570: :ballot_box_with_check: agreed by fixdb.
• 2024-02-26 08:23:41.752152341 +0000 UTC m=+863910.499775449: :ballot_box_with_check: agreed by elsa0520.

[qw4990]

/retest

[qw4990]

/retest

[codecov[bot]]

Codecov Report

:exclamation: No coverage uploaded for pull request base (release-7.1@4d53073). Click here to learn what that means. The diff coverage is 56.5217%.

Additional details and impacted files

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[ti-chi-bot[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: elsa0520, fixdb, hawkingrei

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[winoros]

/retest