…ptional usage fix

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Link to Issue or Description of Change

1. Link to an existing issue (if applicable):

• Closes: Disable forced .env loading #3228

Problem:
Unable to submit request because search_catalog functionDeclaration parameters.project_ids_filter schema didn't specify the schema type field.

None attributes fail on tool registration.

Solution:
Use optionals, for example:
Optional[list[str]] = None,

Testing Plan

Unit Tests:

• I have added or updated unit tests for my change.
• All unit tests pass locally.

Manual End-to-End (E2E) Tests:

Working

Checklist

• I have read the CONTRIBUTING.md document.
• I have performed a self-review of my own code.
• I have commented my code, particularly in hard-to-understand areas.
• I have added tests that prove my fix is effective or that my feature works.
• New and existing unit tests pass locally with my changes.
• I have manually tested my changes end-to-end.
• Any dependent changes have been merged and published in downstream modules.

Additional context

Add any other context or screenshots about the feature request here.