[fix](case) lower cold compaction threshold in fault injection test

[shuke987]

What problem does this PR solve?

Issue Number: N/A

Related PR: #55333

Problem Summary:

test_cold_data_compaction_fault_injection creates five remote rowsets, but the current default cold_data_compaction_score_threshold is 100. The tablet's cold-data compaction score is 5, so the producer keeps skipping it and the case times out while the remote object count stays at 6.

Temporarily set cold_data_compaction_score_threshold to 4 for this case, matching the existing cold_heat_separation/cold_data_compaction.groovy coverage. setBeConfigTemporary restores the original value after the case.

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

  Manual validation:

  • Branch-4.1 test cluster single-case run: PASS 1/1.
  • Remote object count changed from 6 to 7 after one 60-second producer interval.
  • All four BE thresholds were restored from the temporary value 4 to 100.
  • Debug-point cleanup completed.

• 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

[hello-stephen]

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[shuke987]

/review

[shuke987]

run buildall

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