ref(svelte): Remove SvelteKit detection

[Lms24]

When we first created the Svelte SDK, we wanted to gauge how often it is used in a SvelteKit application. Therefore we added some SvelteKit detection logic to annotate events coming from the Svelte SDK. Since we have a SvelteKit SDK now, we don't need to track this anymore. Saves a few bytes, too.

This PR therefore removes the detection and event processing logic

[github-actions]

size-limit report 📦

Path	Size	% Change	Change
@sentry/browser	22.89 KB	-	-
@sentry/browser - with treeshaking flags	22.76 KB	-	-
@sentry/browser (incl. Tracing)	35.77 KB	-	-
@sentry/browser (incl. Tracing, Replay)	72.58 KB	-	-
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags	66.13 KB	-	-
@sentry/browser (incl. Tracing, Replay with Canvas)	76.82 KB	-	-
@sentry/browser (incl. Tracing, Replay, Feedback)	89.56 KB	-	-
@sentry/browser (incl. Feedback)	39.83 KB	-	-
@sentry/browser (incl. sendFeedback)	27.52 KB	-	-
@sentry/browser (incl. FeedbackAsync)	32.3 KB	-	-
@sentry/react	24.73 KB	-	-
@sentry/react (incl. Tracing)	37.67 KB	-	-
@sentry/vue	27.09 KB	-	-
@sentry/vue (incl. Tracing)	37.47 KB	-	-
@sentry/svelte	22.93 KB	-0.42%	-97 B 🔽
CDN Bundle	24.2 KB	-	-
CDN Bundle (incl. Tracing)	35.91 KB	-	-
CDN Bundle (incl. Tracing, Replay)	70.56 KB	-	-
CDN Bundle (incl. Tracing, Replay, Feedback)	75.7 KB	-	-
CDN Bundle - uncompressed	70.76 KB	-	-
CDN Bundle (incl. Tracing) - uncompressed	106.64 KB	-	-
CDN Bundle (incl. Tracing, Replay) - uncompressed	217.49 KB	-	-
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed	230.06 KB	-	-
@sentry/nextjs (client)	38.63 KB	-	-
@sentry/sveltekit (client)	36.2 KB	-0.23%	-85 B 🔽
@sentry/node	156.51 KB	-	-
@sentry/node - without tracing	97.52 KB	-	-
@sentry/aws-serverless	107 KB	-	-

View base workflow run

[codecov]

❌ 1 Tests Failed:

Tests completed	Failed	Passed	Skipped
21	1	20	0

View the full list of 1 ❄️ flaky tests

sdk.test.ts SDK-internal behavior › Injects fetch proxy script for SvelteKit<2.16.0

Flake rate in main: 30.00% (Passed 14 times, Failed 6 times)

Stack Traces | 0.139s run time

sdk.test.ts:4:3 Injects fetch proxy script for SvelteKit<2.16.0

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