fix(traceloop-sdk): add google-generativeai to span processor allowlist

[nishmethuku]

Fixes #621

The @traceloop/instrumentation-google-generativeai package instruments
@google/genai (the replacement for the deprecated @google-cloud/vertexai),
but it was missing from the traceloopInstrumentationLibraries allowlist in
span-processor.ts. This caused GenAI spans to be dropped by the default
Traceloop span processor, while VertexAI spans were exported correctly.

This one-line fix adds the package to the allowlist so spans are exported as expected.

Summary by CodeRabbit

• New Features
  • Added support for tracing Google Generative AI instrumentation by default.
  • Google Generative AI activity can now be included automatically in span processing unless custom instrumentation settings are provided.

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All committers have signed the CLA.

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 3a6cb2d9-eeef-4e33-a0aa-ffddefac80d5

📥 Commits

Reviewing files that changed from the base of the PR and between 1faf69d and d5d983e.

📒 Files selected for processing (1)

• packages/traceloop-sdk/src/lib/tracing/span-processor.ts

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📝 Walkthrough

Walkthrough

The default Traceloop instrumentation library list now includes @traceloop/instrumentation-google-generativeai, allowing the span processor to recognize it unless a custom library allowlist is provided.

Changes

Google Generative AI instrumentation support

Layer / File(s)	Summary
Default instrumentation library registration packages/traceloop-sdk/src/lib/tracing/span-processor.ts	Adds the Google Generative AI instrumentation package to the exported default library list used by createSpanProcessor.

Estimated code review effort: 1 (Trivial) | ~2 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly matches the change to add the Google Generative AI instrumentation to the span processor allowlist.
Linked Issues check	✅ Passed	The allowlist update supports @google/genai by preventing its spans from being dropped, which matches issue #621.
Out of Scope Changes check	✅ Passed	The PR is narrowly scoped to the allowlist change and shows no unrelated code additions.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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