feat(core)!: Remove getDomElement method

[mydea]

I noticed this in #14758, this seems unnecessary and all browsers/envs we support should be able to handle this. We only use this in two places anyhow, so we can just guard there (a bit) for this instead.

I will add a deprecation to v8 for this too, although this is just exported from core and will most likely not affect anybody.

[github-actions]

size-limit report 📦

Path	Size	% Change	Change
@sentry/browser	23.13 KB	-	-
@sentry/browser - with treeshaking flags	21.81 KB	-	-
@sentry/browser (incl. Tracing)	35.61 KB	-0.01%	-2 B 🔽
@sentry/browser (incl. Tracing, Replay)	72.88 KB	-0.02%	-9 B 🔽
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags	63.29 KB	-0.01%	-1 B 🔽
@sentry/browser (incl. Tracing, Replay with Canvas)	77.29 KB	-0.01%	-6 B 🔽
@sentry/browser (incl. Tracing, Replay, Feedback)	89.68 KB	-0.01%	-4 B 🔽
@sentry/browser (incl. Feedback)	39.88 KB	-	-
@sentry/browser (incl. sendFeedback)	27.74 KB	-	-
@sentry/browser (incl. FeedbackAsync)	32.5 KB	-	-
@sentry/react	25.86 KB	-	-
@sentry/react (incl. Tracing)	38.48 KB	-0.01%	-1 B 🔽
@sentry/vue	27.36 KB	-	-
@sentry/vue (incl. Tracing)	37.5 KB	-0.01%	-1 B 🔽
@sentry/svelte	23.29 KB	-0.08%	-17 B 🔽
CDN Bundle	24.21 KB	-	-
CDN Bundle (incl. Tracing)	35.77 KB	+0.03%	+9 B 🔺
CDN Bundle (incl. Tracing, Replay)	70.87 KB	-	-
CDN Bundle (incl. Tracing, Replay, Feedback)	76.17 KB	-0.01%	-4 B 🔽
CDN Bundle - uncompressed	71.09 KB	-	-
CDN Bundle (incl. Tracing) - uncompressed	106.56 KB	-0.05%	-51 B 🔽
CDN Bundle (incl. Tracing, Replay) - uncompressed	220.63 KB	-0.03%	-51 B 🔽
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed	233.83 KB	-0.03%	-51 B 🔽
@sentry/nextjs (client)	38.76 KB	+0.02%	+6 B 🔺
@sentry/sveltekit (client)	36.15 KB	-0.06%	-20 B 🔽
@sentry/node	157.95 KB	-	-
@sentry/node - without tracing	98.84 KB	-0.01%	-1 B 🔽
@sentry/aws-serverless	126.57 KB	-0.01%	-1 B 🔽

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