FIX: Fixes for failing integration tests

[varunj-msft]

Description

Fixes 47 failing integration tests in the ADO CI pipeline to unblock the v0.12.0 release.

1. Bug fixes in test_seed_dataset_provider_integration.py:

   • Added missing await on get_all_dataset_names_async() calls, converted sync tests to async
   • Fixed sizes= to size= matching SeedDatasetMetadata field name
   • Replaced initialize_pyrit_async with sqlite_instance fixture to fix stale singleton DB

2. Skip API key tests (29 failures): Added @pytest.mark.run_only_if_all_tests to tests in test_targets_and_secrets.py, test_azure_content_filter_integration.py, and test_openai_embedding.py that require API keys. Entra auth equivalents still run. test_connect_required_aml_text_targets and test_connect_openai_completion intentionally left unmarked.

3. Skip notebooks (5 failures): Added to skipped_files in 5 notebook test files for notebooks requiring credentials unavailable in CI. Underlying code covered by Entra auth tests.

Tests and Documentation

Test-only changes. Verified locally: all previously-failing tests now pass or are cleanly skipped. No doc changes needed.

[spencrr]

looks good - nonblocking on when we re-enable, to use entra auth if we have that setup!