feat(expr): allow jsonb_strip_nulls to remove null array elements

[howenyap]

I hereby agree to the terms of the RisingWave Labs, Inc. Contributor License Agreement.

What's changed and what's your intention?

Allows jsonb_strip_nulls to remove NULL elements in array via an optional boolean parameter strip_in_arrays

Requested in #23368

Regression tests ported from here

Checklist

• I have written necessary rustdoc comments.
• I have added necessary unit tests and integration tests.
• I have added test labels as necessary.
• I have added fuzzing tests or opened an issue to track them.
• My PR contains breaking changes.
• My PR changes performance-critical code, so I will run (micro) benchmarks and present the results.
• I have checked the Release Timeline and Currently Supported Versions to determine which release branches I need to cherry-pick this PR into.

Documentation

• My PR needs documentation updates.
  Update required here

Release note