[fix](build) Fix build and test scripts failing due to missing executable permission

[heguanhui]

What problem does this PR solve?

Issue Number: close #63225

Problem Summary: Several shell scripts are invoked directly (e.g., ./build.sh) without executable permission, causing "Permission denied" errors during build, FE UT, BE UT, and broker build processes. This PR changes all such invocations to use bash prefix to ensure they execute correctly regardless of file permission settings.

Release note

Fix build and test scripts failing due to missing executable permission by using bash prefix for shell script invocations.

Check List (For Author)

• Test

  • Regression test
  • Unit Test
  • Manual test (add detailed scripts or steps below)
    • Successfully built Doris with bash build.sh --be --fe
    • Successfully ran FE unit tests with bash run-fe-ut.sh
    • Successfully built broker module
  • 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.

[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?

[heguanhui]

Manual Test Report

Test type: Manual test

Test report attachment: 问题及修复.docx

The test report documents the build errors encountered and the fixes applied.