[fix](regression) Wait row count before hot value analyze

[yujun777]

What problem does this PR solve?

Issue Number: None

Related PR: None

Problem Summary:

The hot value analyze regression test can run sample analyze before Cloud table row count metadata is reported. In that state sample analyze treats the table as empty and writes empty column statistics, making the test flaky. This PR waits for SHOW DATA to report the inserted row count before running analyze on non-empty test tables.

Release note

None

Check List (For Author)

• Test

  • Regression test
  • Unit Test
  • Manual test (add detailed scripts or steps below)
  • No need to test or manual test. Explain why:
    • This is a refactor/code format and no logic has been changed.
    • Previous test can cover this change.
    • No code files have been changed.
    • Other reason

• Behavior changed:

  • No.
  • Yes.

• Does this need documentation?

  • No.
  • Yes.

Check List (For Reviewer who merge this PR)

• Confirm the release note
• Confirm test cases
• Confirm document
• Add branch pick label

Tests:

./build.sh --fe
./run-regression-test.sh --run -d statistics -s test_full_analyze_hot_value
git diff --check

[hello-stephen]

Thank you for your contribution to Apache Doris.
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Please clearly describe your PR:

1. What problem was fixed (it's best to include specific error reporting information). How it was fixed.
2. Which behaviors were modified. What was the previous behavior, what is it now, why was it modified, and what possible impacts might there be.
3. What features were added. Why was this function added?
4. Which code was refactored and why was this part of the code refactored?
5. Which functions were optimized and what is the difference before and after the optimization?

[yujun777]

run buildall