feat: move BigQuery to clientless validation#144
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Replace the `google.cloud.bigquery` / `google.api_core.client_options` / `google.auth.credentials` imports with a stdlib `urllib.request` REST probe against the emulator's `/bigquery/v2/projects/<project>/queries` endpoint, mirroring the Elasticsearch (#139), Valkey (#138), and Redis family (#136) clientless conversions. - src/pytest_databases/docker/bigquery.py: drop the three `google.*` imports; remove `credentials` and `client_options` from `BigQueryService` (keep `host`, `port`, `container`, `project`, `dataset`, and the `endpoint` property); add a `_query_bigquery_emulator(host, port, project, sql, *, timeout=2.0)` helper that POSTs `{"query": sql, "useLegacySql": false}` and parses the response; rewrite `check()` to call the helper with `SELECT 1 as one` and assert `jobComplete and rows[0].f[0].v == "1"`, swallowing `URLError`/`HTTPError`/`JSONDecodeError`/`TimeoutError`/`OSError`; delete the `bigquery_client` fixture. The emulator `--dataset=` start flag and `DATASET_NAME` env var are preserved so the default dataset is still auto-created by the emulator binary itself. - tests/test_bigquery.py: rewrite to drive the emulator through stdlib `urllib.request` only; preserve `test_service_fixture` (SELECT 1 via REST); drop `test_client_fixture`; rewrite `test_xdist` to issue `CREATE TABLE` against `bigquery_service.dataset` via the REST endpoint; add `test_plugin_imports_without_google_cloud_bigquery` regression guard that intercepts `google.cloud.bigquery`, `google.api_core.client_options`, and `google.auth.credentials` via `builtins.__import__`. - pyproject.toml: empty the `bigquery` compatibility extra so `pytest-databases[bigquery]` no longer pulls in `google-cloud-bigquery`; drop the `pytest_databases.docker.bigquery` `attr-defined` mypy override now that the module no longer touches Google client attribute surface. - docs/supported-databases/bigquery.rst: rewrite the example in the user-owned-client style; users now build their own `bigquery.Client` from `bigquery_service.endpoint`, `bigquery_service.project`, and `AnonymousCredentials()`. - uv.lock: drop `google-cloud-bigquery`, `google-crc32c`, and `google-resumable-media`.
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Drop
google-cloud-bigqueryfrom thebigqueryextra. Readiness now uses a stdliburllib.requestPOST against/bigquery/v2/projects/<project>/querieswithSELECT 1, andBigQueryServiceno longer carriescredentialsorclient_options.The default dataset is still created automatically — the emulator's
--dataset=test-datasetstartup flag handles it, so the dataset exists when the fixture yields.The bundled
bigquery_clientfixture is removed. Users construct their ownbigquery.Client(project=service.project, client_options=ClientOptions(api_endpoint=service.endpoint), credentials=AnonymousCredentials()).