Fix workers observability needle schema

[FranciscoMaxwell]

• I understand that this repository is auto-generated and my pull request may not be merged

Changes being requested

Fixes #2737.

• Make SharedQueryGetResponse's RunQueryParametersNeedleValue a BaseModel, matching the same type in telemetry_query_response.py.
• Add a regression test that forces RunQueryParametersNeedle to rebuild its Pydantic schema.

Additional context & links

This avoids the Pydantic schema generation failure reported for the Workers Observability types when newer Pydantic/Python versions eagerly rebuild the model schema.

Tests:

• .\.venv\Scripts\python.exe -m pytest tests/api_resources/workers/observability/test_shared_queries.py::TestSharedQueries::test_run_query_parameters_needle_schema_rebuilds
• .\.venv\Scripts\python.exe -m compileall src/cloudflare/types/workers/observability/shared_query_get_response.py tests/api_resources/workers/observability/test_shared_queries.py
• Manual smoke: RunQueryParametersNeedle.model_rebuild(force=True) and client.workers import/access