[fix](cloud) Fix the issue where it takes a long time to come alive o…

[deardeng]

…n first boot

What problem does this PR solve?

fix heartbeat abort txn too slow，This caused the first startup to take a very long time to come alive.

Issue Number: close #xxx

Related PR: #xxx

Problem Summary:

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

[Thearas]

Thank you for your contribution to Apache Doris.
Don't know what should be done next? See How to process your PR.

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?

[deardeng]

run buildall

[hello-stephen]

Cloud UT Coverage Report

Increment line coverage 50.00% (3/6) 🎉

Increment coverage report
Complete coverage report

Category	Coverage
Function Coverage	80.77% (1705/2111)
Line Coverage	66.81% (29830/44650)
Region Coverage	67.37% (14886/22097)
Branch Coverage	57.59% (7921/13754)

[gavinchou]

do we need sleep here?
if not use macro test_sync_point _return() instead

[yujun777]

one BE one thread, if many be may cause thread, use 1 thread pool executor is more safe