[bugfix](becore) pipeline core when workload group shutdown

[yiguolei]

What problem does this PR solve?

1. When workload group shutdown, it will shutdown pipeline task scheduler.
2. In pipelinetask scheduler, it will first call task queue.close, in this method it will deconstruct priority task queue.
3. But at this time, the pipeline task thread is not stopped.
   So that it will core.
   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?

[yiguolei]

run buildall

[doris-robot]

BE UT Coverage Report

Increment line coverage 🎉

Increment coverage report
Complete coverage report

Category	Coverage
Function Coverage	40.95% (10796/26362)
Line Coverage	31.81% (92172/289762)
Region Coverage	30.88% (47561/154030)
Branch Coverage	27.38% (24375/89014)

[dataroaring]

LGTM