fix(nextjs): Use global scope for generic event filters

[lforst]

While doing #12194 I noticed that there were some inconsistencies with how the generic event processors were running in nextjs and I think it might be because we are attaching to an isolation scope instead of a global scope.

[github-actions]

size-limit report 📦

Path	Size
@sentry/browser	21.74 KB (0%)
@sentry/browser (incl. Tracing)	32.77 KB (-0.36% 🔽)
@sentry/browser (incl. Tracing, Replay)	68.23 KB (-0.03% 🔽)
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags	61.64 KB (-0.04% 🔽)
@sentry/browser (incl. Tracing, Replay with Canvas)	72.27 KB (-0.01% 🔽)
@sentry/browser (incl. Tracing, Replay, Feedback)	84.31 KB (-0.04% 🔽)
@sentry/browser (incl. Feedback)	37.75 KB (0%)
@sentry/browser (incl. sendFeedback)	26.31 KB (0%)
@sentry/browser (incl. FeedbackAsync)	30.73 KB (0%)
@sentry/react	24.43 KB (0%)
@sentry/react (incl. Tracing)	35.75 KB (-0.35% 🔽)
@sentry/vue	25.68 KB (0%)
@sentry/vue (incl. Tracing)	34.58 KB (-0.35% 🔽)
@sentry/svelte	21.88 KB (0%)
CDN Bundle	24.28 KB (0%)
CDN Bundle (incl. Tracing)	34.22 KB (-0.36% 🔽)
CDN Bundle (incl. Tracing, Replay)	68.02 KB (-0.04% 🔽)
CDN Bundle (incl. Tracing, Replay, Feedback)	73.01 KB (-0.03% 🔽)
CDN Bundle - uncompressed	71.46 KB (0%)
CDN Bundle (incl. Tracing) - uncompressed	101.55 KB (-0.32% 🔽)
CDN Bundle (incl. Tracing, Replay) - uncompressed	211.43 KB (-0.03% 🔽)
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed	223.79 KB (-0.03% 🔽)
@sentry/nextjs (client)	35.12 KB (-0.06% 🔽)
@sentry/sveltekit (client)	33.36 KB (-0.37% 🔽)
@sentry/node	114.32 KB (0%)
@sentry/aws-serverless	103.2 KB (-0.01% 🔽)