debug(bigquery): add debug logging for temp table inference issue

[sgomezvillamor]

Add debug logging to investigate why legitimate BigQuery tables are being incorrectly inferred as temp tables during lineage extraction.

• queries_extractor.py: Debug temp table inference conditions
• bigquery_schema_gen.py: Debug table discovery and pattern filtering

This will help identify whether the issue is missing table discovery, pattern filtering, or format mismatches.

[codecov]

Codecov Report

❌ Patch coverage is 87.50000% with 3 lines in your changes missing coverage. Please review.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
...ngestion/source/bigquery_v2/bigquery_schema_gen.py	84.21%	3 Missing ⚠️

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