feat(config): add location to Configure.Generative.google_vertex (#2073)

[Anai-Guo]

Closes #2073.

Problem

The generative-google module in Weaviate core reads a location class setting (modules/generative-google/config/class_settings.go: locationProperty = "location", DefaultGoogleLocation = "us-central1"), separate from the existing region setting. The Python client's _GenerativeGoogleConfig has region but no location, so there is no way to set it from Configure.Generative.* — the server default always applies.

Change

• _GenerativeGoogleConfig gains an optional location field.
• Configure.Generative.google_vertex(...) gains an optional location argument (documented as defaulting to the server-defined us-central1).
• The other constructors that build _GenerativeGoogleConfig (palm, google, google_gemini) pass location=None, so nothing changes for them.

Because the field is Optional and the model is serialized with exclude_none, an unset location is simply absent from the module config — existing collection configurations serialize byte-for-byte as before.

Scope note

This covers the collection-config half of #2073 only. The runtime/query-time half is not included: the GenerativeGoogle gRPC message (weaviate/proto/v1/v6300/v1/generative_pb2.pyi) has region but no location field, which matches the issue's note that "this change needs newest protos". Once the protos carry location, the runtime provider in weaviate/collections/classes/generative.py can be extended in a follow-up.

Tests

Added two parametrized cases to test_config_with_generative, which had no google_vertex coverage at all:

• google_vertex(project_id=...) → {"generative-palm": {"projectId": "project"}} (regression guard: no new key leaks in when location is unset)
• google_vertex(...) with every argument, including region and location, asserting both land in the module config

$ python -m pytest test/collection/test_config.py -q
193 passed

$ python -m pytest test/ -q
2 failed, 386 passed, 1 skipped

Both failures are in test/test_timeout.py and reproduce identically on an unmodified checkout of main (ae327ca) on this machine — they are pre-existing and unrelated.

Lint, matching .pre-commit-config.yaml pins:

$ ruff 0.14.7 check / format --check   → All checks passed / 2 files already formatted
$ flake8 7.3.0 (+bugbear, comprehensions, builtins, docstrings, pydoclint)  → clean

🤖 Generated with Claude Code

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Orca Security Scan Summary

Status	Check	Issues by priority
Passed	Infrastructure as Code	0   0   0   0	View in Orca
Passed	SAST	0   0   0   0	View in Orca
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[Anai-Guo]

I agree with the Weaviate Contributor License Agreement.