chore: track missing experimental features in telemetry

[github-actions]

Note

The pull request "chore: track missing experimental features in telemetry" was created by @itaybre but did not reference an issue. Therefore this issue was created for better visibility in external tools like Linear.

Summary

Checked options marked as experimental not being tracked

• Add telemetry tracking for three experimental features that were missing from SentryEnabledFeaturesBuilder:
  • watchdogTerminationsV2 (experimental.enableWatchdogTerminationsV2)
  • viewHierarchy (attachViewHierarchy)
  • screenshotFastViewRendering (screenshot.enableFastViewRendering)
• Add tests for each new tracked feature (enabled + disabled)

Test plan

• make build-ios FOR_AGENTS=true passes
• make test-ios FOR_AGENTS=true ONLY_TESTING=SentryTests/SentryEnabledFeaturesBuilderTests — all 23 tests pass

#skip-changelog

[linear-code]

COCOA-1737