FCE-3295: Fix media event queue order catch

[MiloszFilimowski]

Description

• webRTCEndpoint.ts: chain .catch() before .then() on mediaEventQueue so a rejected prior event doesn't propagate the same rejection to every subsequent receiveMediaEvent caller.

Motivation and Context

Previous order assigned the caught queue back to mediaEventQueue but returned the uncaught next, so one failed handler would reject every queued event after it. Catching first keeps the queue alive and isolates failures to their own caller.

Documentation impact

• Documentation update required
• Documentation updated in another PR
• No documentation update required

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to
  not work as expected)

[linear]

FCE-3295 Fix media event queue order catch