[PLAT-8614] Prevent reporting of OOMs on simulators

[nickdowell]

Goal

Prevent reporting of (false positive) OOMs on simulators.

Apps running in the simulator are not killed by the system in response to memory warnings. OOMs reported from the simulator are therefore most likely to be due to the app being killed by Xcode when running without a debugger attached, and it does not make sense to report these.

Changeset

BSG_HAVE_OOM_DETECTION now evaluates to 0 when building for simulators.

Testing

Verified using local test app. E2E tests on CI verify that OOM reporting still works on real devices.

[github-actions]

	1 Warning
⚠️	This PR modifies BSGRunContext.h but does not change BSGRUNCONTEXT_VERSION

Bugsnag.framework binary size did not change - 815,472 bytes

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