feat: update unhandled promise rejection handling

[ccschmitz-launchdarkly]

Summary

Updates our logic for unhandled promise rejections:

• Ties into the HermesInternal.enablePromiseRejectionTracker hook for setting up a handler.
• Removes our filtering of network request errors in our old promise rejection handler.
• Adds specific support for Axios errors.
• Adds axios to our E2E app + some UI for testing requests with different status codes.

How did you test this change?

Click tested in the RN demo app: https://www.loom.com/share/a6097e43c137463fa9d1c6c6cc94895a

Are there any deployment considerations?

Follow up with Axios customers who have mentioned not seeing errors for failed requests.

JIRA Issue: https://launchdarkly.atlassian.net/browse/O11Y-586

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Note

Switches unhandled promise rejection handling to Hermes tracker, adds Axios-aware error extraction, updates the demo app with Axios test actions, and expands tests.

• SDK (observability-react-native):
  • Unhandled Rejections: Integrates HermesInternal.enablePromiseRejectionTracker and removes Promise monkey-patching; stops filtering network errors; uses extractRejectionDetails to enrich attributes (Axios/fetch/primitives/objects).
  • Console Handling: Captures only console.error (drops console.warn capture); simplifies attributes.
  • Utilities: Adds extractRejectionDetails (Axios/fetch/primitives/object parsing); removes isNetworkError checks.
  • Mocks: Adds ErrorUtils and Vitest vi to RN mock.
• Tests:
  • New/expanded tests for unhandled rejections (Hermes callbacks), Axios errors, primitives/objects, and utilities; updates cleanup expectations.
• E2E App (react-native-otel):
  • Adds Axios dependency and UI buttons to trigger success/404/500 requests with new button styles.
  • Removes custom global error/promise/fetch handlers from _layout.tsx.
• Dependencies:
  • Adds axios to app and SDK dev deps; updates yarn.lock.

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[SpennyNDaJets]

LGTM