fix(gemini): Support BUILT_IN_TOOLS.

[daavoo]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

Files with missing lines	Coverage Δ
src/any_llm/any_llm.py	77.82% <ø> (ø)
src/any_llm/providers/gemini/base.py	86.77% <100.00%> (+0.11%)	⬆️
src/any_llm/providers/gemini/utils.py	89.81% <100.00%> (+0.59%)	⬆️

... and 25 files with indirect coverage changes

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[daavoo]

Integration tests: https://github.com/mozilla-ai/any-llm/actions/runs/18125998519