br: add a test for cached table (#31191)

[ti-srebot]

cherry-pick #31191 to release-6.0
You can switch your code base to this Pull Request by using git-extras:

# In tidb repo:
git pr https://github.com/pingcap/tidb/pull/37075

After apply modifications, you can push your change to this PR via:

git push git@github.com:ti-srebot/tidb.git pr/37075:release-6.0-7ca368650c63

---

What problem does this PR solve?

Issue Number: close #31190

Problem Summary:

Handle the compatibility for the cached table feature with br

What is changed and how it works?

TableCacheStatus attribute of table info is ignored, so a cached table is handled as a normal table.

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]

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[ti-chi-bot]

@ti-srebot: This cherry pick PR is for a release branch and has not yet been approved by release team.
Adding the do-not-merge/cherry-pick-not-approved label.

To merge this cherry pick, it must first be approved by the collaborators.

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[ti-srebot]

/run-all-tests

[ti-srebot]

@tiancaiamao you're already a collaborator in bot's repo.

[xhebox]

Close. Since we can not approve PR for 6.0.