Don't drop unhandled errors when Spike Protection is activated

[realkosty]

Problem Statement

Prospective customer would like Spike Protection 2.0 not to drop unhandled exceptions. They care more about crashes and don’t want to lose that information but would be happy to drop spiking non-fatal errors to prevent depleting quota.

Solution Brainstorm

We've considered using a separate project for unhandled errors and not enabling SP for that project.
However:

1. Seems not possible right now (or has severe limitations, see Support two instances of sentry sentry-cocoa#2037) for customer's platform, iOS.
2. Comes with the inconvenience of having 2 projects for the same app.

┆Issue is synchronized with this Jira Improvement by Unito

[getsantry]

Assigning to @getsentry/support for routing, due by Tuesday, April 18th at 4:41 pm (sfo). ⏲️

[Dhrumil-Sentry]

@realkosty Thanks a lot for bringing this up I'll add this to our backlog but we're unlikely to make further enhancements for the next few quarters atleast