fix(logger): defensively collect no git metadata when org returns nothing

[Alex R (alexr17)]

Summary

When the control plane returns no git_metadata configuration, the SDK now collects nothing instead of substituting SDK-side defaults. This eliminates duplicate default maintenance between SDK and control plane and aligns with feedback from the corresponding JS SDK PR.

Changes

• Removed DEFAULT_GIT_METADATA_FIELDS and default_git_metadata_settings() from git_fields.py
• Updated logger.py _check_org_info() to fall back to collect="none" when org has no git_metadata
• Updated gitutil.py get_repo_info() to fall back to collect="none" when settings is None
• Updated docstrings in framework.py to reflect that collection defers to org-level settings
• Added tests to verify new behavior

Test plan

• All 3 new unit tests pass
• All 448 existing tests in test_core pass
• No regressions

[Abhijeet Prasad (AbhiPrasad)]

is this a breaking change for self hosted customers? If it is, is that okay?

[Alex R (alexr17)]

is this a breaking change for self hosted customers? If it is, is that okay?

I'm not sure how breaking it would be but this is the direction we want to go in based on:
braintrustdata/braintrust-sdk-javascript#1972 (comment)