Add integration with Session Replay product for Apple platforms

[tustanivsky]

This PR adds Session Replay product integration for platforms where sentry-cocoa is used (macOS and iOS). The gameplay recorded in the rolling buffer before a crash is now delivered to Sentry as a separate session replay envelope (discoverable in the Replays dashboard and associated with the crash) instead of only being attached to the event as an MP4 file. This closes the macOS limitation noted in #1445 and extends the integration to iOS.

Since sentry-cocoa sends crash reports on the next application launch, the replay envelope is assembled in-process within the onLastRunStatusDetermined callback: the plugin reads the recorded MP4 and its JSON metadata sidecar, builds the replay_event/replay_recording payloads, packs them together with the video into a msgpack payload (same wire format as sentry-cocoa's own SentryMsgPackSerializer and the sentry-native implementation), and hands the envelope to the SDK for sending via the internal envelope API.

Example replay captured on macOS.

Key Changes

• Added AppleSentryReplayEnvelope which builds the replay_video envelope from the recorded clip, its metadata sidecar, and the crash event from the previous app run, and captures it through sentry-cocoa's envelope API.
• The replay event is enriched from the crash event's scope (tags, contexts, release, environment, dist, user) and the matching trace id so it correlates with the crash's events/spans; the replay window is anchored to the crash timestamp.
• GetLatestSessionReplay now resolves both the replay video and its metadata sidecar, succeeding only when the latest pair belongs to the same replay.
• Replay files (MP4 + JSON sidecar) are cleaned up explicitly after processing on both crash and no-crash launches (previously the metadata sidecar was left behind).
• The replay clip remains attached to the crash event as an MP4 attachment (rollout parity with the sentry-native platforms).

Testing

• Extended integration test checks for replay envelope capturing to Apple platforms.

Documentation

• docs(unreal): Session Replay product integration sentry-docs#18670

Related items

• Add integration with Session Replay product for native platforms #1445
• Add experimental session replay capturing on iOS (UE 5.8+) #1462

[github-actions]

	Messages
📖	Do not forget to update Sentry-docs with your feature once the pull request gets approved.

Generated by 🚫 dangerJS against 468f19c

[cursor]

Cursor Bugbot has reviewed your changes and found 1 potential issue.

^{❌ Bugbot Autofix is OFF. To automatically fix reported issues with cloud agents, enable autofix in the Cursor dashboard.}

^{Reviewed by Cursor Bugbot for commit aa413ff. Configure here.}