Remove warnings and fixing tests

[spiani]

No description provided.

[Copilot]

Pull request overview

This PR focuses on reducing warnings and stabilizing tests by tightening config validation, updating test fixtures, and avoiding eager xarray imports in EFAS code.

Changes:

• Add bgc_profiles to the test config fixture so biogeochemical_profile references resolve.
• Add explicit validation/error for undefined biogeochemical_profile references during config loading.
• Introduce a lazy xarray proxy and switch EFAS manager imports/type annotations to avoid eager xarray import.

Reviewed changes

Copilot reviewed 5 out of 6 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
tests/fixtures.py	Extends the sample JSON fixture with bgc_profiles used by test rivers.
src/ogs_riverger/utils/lazy_xarray.py	Adds a module-level lazy proxy to defer importing xarray until first attribute access.
src/ogs_riverger/read_config.py	Adds validation for missing/undefined biogeochemical profile references.
src/ogs_riverger/efas/efas_manager.py	Replaces eager xarray import with the lazy proxy and updates annotations to avoid runtime evaluation.
pyproject.toml	Adjusts dev dependency constraints for deptry and pytest-asyncio.

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