Add beforeErrorSampling for Session Replay

[sentry-junior]

Applications need to exclude specific errors from triggering Session Replay while still reporting those errors to Sentry. Cocoa currently exposes onErrorSampleRate, but no per-error callback for this decision.

• The current sampling implementation only compares a random value against onErrorSampleRate.
• Dropping an event in beforeSend also prevents it from triggering replay, but discards the error itself. This differs from retaining the error while excluding it from replay sampling; see Change order of event processing to filter replay events with beforeSend #5735 for the existing filtering behavior.
• Android already provides beforeErrorSampling: returning false skips replay capture for that error; returning true proceeds with the normal onErrorSampleRate check.

Requested proposal: expose an equivalent beforeErrorSampling callback in the Cocoa SDK so applications can filter which errors trigger buffered replays without dropping the error events.

via Ido Shemesh.

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View Junior Session [Sentry]

[linear-code]

COCOA-1915