Clean up CBDB_PARALLEL_FIXME

[avamingli]

Cloudberry Database version

@ 5f9190e

What happened

There are 73 CBDB_PARALLEL_FIXME of 27 files.

What you think should happen instead

No response

How to reproduce

NA

Operating System

NA

Anything else

No response

Are you willing to submit PR?

• Yes, I am willing to submit a PR!

Code of Conduct

• I agree to follow this project's Code of Conduct.