test(sveltekit): Add SvelteKit 2.0 E2E test app

[Lms24]

Requires #9872 to be merged first but otherwise ready for review.

This PR adds a Sveltekit 2.0 E2E test application. Currently, we only test building. This shows that with #9872, our SDK works in SvelteKit 2.0. We should however add actual tests to both Kit 1.x and 2.x test apps. Will take a look at it this week. Maybe also canary tests, let's se...

[github-actions]

size-limit report 📦

Path	Size
@sentry/browser (incl. Tracing, Replay, Feedback) - Webpack (gzipped)	75.14 KB (0%)
@sentry/browser (incl. Tracing, Replay) - Webpack (gzipped)	66.57 KB (0%)
@sentry/browser (incl. Tracing, Replay) - Webpack with treeshaking flags (gzipped)	60.16 KB (0%)
@sentry/browser (incl. Tracing) - Webpack (gzipped)	31.23 KB (0%)
@sentry/browser (incl. Feedback) - Webpack (gzipped)	29.85 KB (0%)
@sentry/browser - Webpack (gzipped)	21.53 KB (0%)
@sentry/browser (incl. Tracing, Replay, Feedback) - ES6 CDN Bundle (gzipped)	72.57 KB (0%)
@sentry/browser (incl. Tracing, Replay) - ES6 CDN Bundle (gzipped)	64.28 KB (0%)
@sentry/browser (incl. Tracing) - ES6 CDN Bundle (gzipped)	30.54 KB (0%)
@sentry/browser - ES6 CDN Bundle (gzipped)	22.59 KB (0%)
@sentry/browser (incl. Tracing, Replay) - ES6 CDN Bundle (minified & uncompressed)	202.16 KB (0%)
@sentry/browser (incl. Tracing) - ES6 CDN Bundle (minified & uncompressed)	92.26 KB (0%)
@sentry/browser - ES6 CDN Bundle (minified & uncompressed)	67.31 KB (0%)
@sentry/browser (incl. Tracing) - ES5 CDN Bundle (gzipped)	33.4 KB (0%)
@sentry/react (incl. Tracing, Replay) - Webpack (gzipped)	66.92 KB (0%)
@sentry/react - Webpack (gzipped)	21.57 KB (0%)
@sentry/nextjs Client (incl. Tracing, Replay) - Webpack (gzipped)	83.71 KB (0%)
@sentry/nextjs Client - Webpack (gzipped)	48.39 KB (0%)
@sentry-internal/feedback - Webpack (gzipped)	16.18 KB (0%)