[MLOB-4143] Remove ref to deleted google generativeai integration

[Yun-Kim]

What does this PR do? What is the motivation?

Removes references to LLMObs' deleted google_generativeai integration (which was removed because the underlying library is now end-of-life as well as lack of customer usage because it was already deprecated)

Merge instructions

Merge readiness:

• Ready for merge

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Additional notes

[github-actions]

Preview links (active after the build_preview check completes)

Modified Files

• https://docs-staging.datadoghq.com/yunkim/llmobs-remove-google-generativeai/llm_observability/instrumentation/auto_instrumentation