fix(browser): Allow SDK initialization in NW.js apps

[Lms24]

Looks like our browser extension check that blocks SDK initalization via Sentry.init also blocked initializing
the SDK in NW.js apps. This PR adds a check for the window.nw property to handle this case.

Note: If we get more reports like this, we should consider adding a flag to force-init the SDK when this
check wrongfully blocks sdk init. For now though, I wanna hold off from expanding public API.

fixes #12668

[github-actions]

size-limit report 📦

Path	Size
@sentry/browser	22.31 KB (+0.06% 🔺)
@sentry/browser (incl. Tracing)	33.45 KB (+0.03% 🔺)
@sentry/browser (incl. Tracing, Replay)	69.2 KB (+0.02% 🔺)
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags	62.53 KB (+0.02% 🔺)
@sentry/browser (incl. Tracing, Replay with Canvas)	73.27 KB (+0.02% 🔺)
@sentry/browser (incl. Tracing, Replay, Feedback)	85.89 KB (+0.02% 🔺)
@sentry/browser (incl. Tracing, Replay, Feedback, metrics)	87.75 KB (+0.02% 🔺)
@sentry/browser (incl. metrics)	26.59 KB (+0.05% 🔺)
@sentry/browser (incl. Feedback)	38.98 KB (+0.03% 🔺)
@sentry/browser (incl. sendFeedback)	26.92 KB (+0.04% 🔺)
@sentry/browser (incl. FeedbackAsync)	31.54 KB (+0.03% 🔺)
@sentry/react	25.05 KB (+0.06% 🔺)
@sentry/react (incl. Tracing)	36.49 KB (+0.04% 🔺)
@sentry/vue	26.41 KB (+0.05% 🔺)
@sentry/vue (incl. Tracing)	35.31 KB (+0.04% 🔺)
@sentry/svelte	22.44 KB (+0.07% 🔺)
CDN Bundle	23.52 KB (+0.05% 🔺)
CDN Bundle (incl. Tracing)	35.21 KB (+0.03% 🔺)
CDN Bundle (incl. Tracing, Replay)	69.31 KB (+0.01% 🔺)
CDN Bundle (incl. Tracing, Replay, Feedback)	74.51 KB (+0.02% 🔺)
CDN Bundle - uncompressed	69.02 KB (+0.04% 🔺)
CDN Bundle (incl. Tracing) - uncompressed	104.04 KB (+0.03% 🔺)
CDN Bundle (incl. Tracing, Replay) - uncompressed	214.43 KB (+0.02% 🔺)
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed	227.15 KB (+0.01% 🔺)
@sentry/nextjs (client)	36.37 KB (+0.04% 🔺)
@sentry/sveltekit (client)	34.1 KB (+0.04% 🔺)
@sentry/node	130.79 KB (0%)
@sentry/node - without tracing	91.88 KB (0%)
@sentry/aws-serverless	117.05 KB (0%)