Use shared git output sanitizer in prefect-bitbucket

[zzstoatzz]

Depends on Prefect >=3.7.4, which includes prefect._internal.urls.strip_auth_from_urls_in_text from #22196.

This is a draft adoption PR for prefect-bitbucket.

Changes

• sanitize Bitbucket repository block async and sync clone stderr with the shared core helper
• pass configured Bitbucket token material as extra redaction secrets so token echoes outside URL-shaped stderr are also redacted
• add regression coverage for a malformed credential URL such as https://dev:p@ss:word#1@bitbucket.org/...
• bump the package's Prefect lower bound to prefect>=3.7.4

Validation

• uv run pytest tests/test_repository.py -q -k redacts_token_in_clone_error from src/integrations/prefect-bitbucket
• uv run ruff check src/integrations/prefect-bitbucket/prefect_bitbucket/repository.py src/integrations/prefect-bitbucket/tests/test_repository.py from repo root
• uv run ruff format --check src/integrations/prefect-bitbucket/prefect_bitbucket/repository.py src/integrations/prefect-bitbucket/tests/test_repository.py from repo root