fix: isolate mediaDevices traces

[oliverlaz]

💡 Overview

Continuation of #1765. mediaDevice traces were tracked in a single shared Tracer instance.
While this is ok for the majority of the integrations, this can be problematic for customers allowing one to be connected to two separate call instances from a single browser tab.
This PR scopes the traces to the call instance.

📝 Implementation notes

• We aren't patching browser built-in mediaDevice APIs anymore
• We are drilling down a tracer instance in the lowest level APIs
• We can't capture getUserMedia invocations triggered outside of our SDK anymore
• Updates the format of the create trace - we include the SFU name in it now

🎫 Ticket: https://linear.app/stream/issue/REACT-365/rtc-tracing-and-performance-stats-tracking

[Copilot]

Pull Request Overview

This pull request aims to isolate mediaDevices tracing to individual call instances rather than using a single shared Tracer. Key changes include:

• Removing the global patching of browser mediaDevices APIs.
• Propagating a Tracer instance through various modules (stats, devices, and call) to enable scoped tracing.
• Updating trace handling in the SfuStatsReporter and device management modules.

Reviewed Changes

Copilot reviewed 16 out of 16 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
packages/client/src/stats/utils.ts	Added a helper function dumpStream for serializing MediaStream data.
packages/client/src/stats/rtc/mediaDevices.ts	Removed global patching of mediaDevices APIs.
packages/client/src/stats/SfuStatsReporter.ts	Replaced mediaStatsTracer with call-scoped tracers and updated snapshot and rollback logic.
packages/client/src/rtc/BasePeerConnection.ts	Modified tracing tag composition and trace payload to include SFU edge information.
packages/client/src/devices/devices.ts	Updated media stream acquisition functions to accept a tracer parameter and log success/failure traces.
packages/client/src/devices/tests/*	Updated tests to expect tracer parameters and error message adjustments.
packages/client/src/devices/SpeakerState.ts	Changed tracer reference from a legacy import to instance injection.
packages/client/src/devices/SpeakerManager.ts	Instantiated a Tracer and passed it into SpeakerState.
packages/client/src/devices/ScreenShareManager.ts	Updated screen share stream requests to include the tracer parameter and adjusted error messages.
packages/client/src/devices/MicrophoneManager.ts	Propagated the tracer to the getAudioStream call.
packages/client/src/devices/InputMediaDeviceManager.ts	Injected a new tracer instance and adjusted the constructor signature.
packages/client/src/devices/CameraManager.ts	Updated getVideoStream to pass the tracer instance through.
packages/client/src/Call.ts	Aggregated multiple tracer instances and updated tracing enabling logic.
packages/client/index.ts	Removed the side-effect global mediaDevices patching import.

Comments suppressed due to low confidence (1)

packages/client/src/devices/InputMediaDeviceManager.ts:34

• [nitpick] The inline initialization of 'tracer' with 'null' may be confusing; consider clarifying its intended usage or ensuring it is properly overridden via constructor injection when a valid tracer is available.

tracer = new Tracer(null);