fix(core): fatal events should set session as crashed

[timfish]

In the Electron SDK, we have to manually set sessions as crashed when native crashes are encountered:
https://github.com/getsentry/sentry-electron/blob/dabd6daf0c19c2a6f224d1e721eb5d58c3cf61ac/src/main/integrations/sentry-minidump/index.ts#L175

This has the downside that if you return null in beforeSend, the event still impacts the release health crash rate.

I found that this was required because _updateSessionFromEvent in @sentry/core does not consider the Electron native events as a crash or an error because there are no exceptions in the event.

This PR ensures that any event with a fatal level is considered a crash.

[timfish]

I'm also going to backport this to v8!

[github-actions]

size-limit report 📦

Path	Size	% Change	Change
@sentry/browser	22.87 KB	+0.03%	+6 B 🔺
@sentry/browser - with treeshaking flags	21.55 KB	+0.03%	+6 B 🔺
@sentry/browser (incl. Tracing)	35.57 KB	+0.02%	+7 B 🔺
@sentry/browser (incl. Tracing, Replay)	72.38 KB	+0.02%	+8 B 🔺
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags	62.88 KB	+0.02%	+9 B 🔺
@sentry/browser (incl. Tracing, Replay with Canvas)	76.64 KB	+0.01%	+7 B 🔺
@sentry/browser (incl. Tracing, Replay, Feedback)	88.64 KB	+0.01%	+9 B 🔺
@sentry/browser (incl. Feedback)	39.1 KB	+0.02%	+6 B 🔺
@sentry/browser (incl. sendFeedback)	27.52 KB	+0.03%	+7 B 🔺
@sentry/browser (incl. FeedbackAsync)	32.29 KB	+0.03%	+7 B 🔺
@sentry/react	25.58 KB	+0.02%	+5 B 🔺
@sentry/react (incl. Tracing)	38.37 KB	+0.02%	+4 B 🔺
@sentry/vue	26.96 KB	+0.01%	+2 B 🔺
@sentry/vue (incl. Tracing)	37.32 KB	+0.02%	+4 B 🔺
@sentry/svelte	23.01 KB	+0.03%	+6 B 🔺
CDN Bundle	24.28 KB	+0.03%	+5 B 🔺
CDN Bundle (incl. Tracing)	35.92 KB	+0.02%	+5 B 🔺
CDN Bundle (incl. Tracing, Replay)	70.55 KB	+0.01%	+5 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback)	75.69 KB	+0.02%	+9 B 🔺
CDN Bundle - uncompressed	70.85 KB	+0.03%	+15 B 🔺
CDN Bundle (incl. Tracing) - uncompressed	106.47 KB	+0.02%	+15 B 🔺
CDN Bundle (incl. Tracing, Replay) - uncompressed	217.3 KB	+0.01%	+15 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed	229.83 KB	+0.01%	+15 B 🔺
@sentry/nextjs (client)	38.48 KB	+0.01%	+3 B 🔺
@sentry/sveltekit (client)	36.12 KB	+0.01%	+1 B 🔺
@sentry/node	161.36 KB	+0.01%	+8 B 🔺
@sentry/node - without tracing	97.15 KB	+0.01%	+9 B 🔺
@sentry/aws-serverless	127.04 KB	+0.01%	+4 B 🔺

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