[test](regression) Wait for index change jobs in multi-index test

[hoshinojyunn]

What problem does this PR solve?

Issue Number: #xxx

Related PR: #xxx

Problem Summary:

The multi-index regression test waited for the latest column alter job after dropping an inverted index. Index removal rewrites existing rowsets asynchronously through an index change job, so the column alter state can be finished while old rowsets still retain the dropped index. Wait for the build index job after each DROP INDEX statement before running the following queries.

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

[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?

[hoshinojyunn]

run buildall

[hoshinojyunn]

run buildall