ci: Reduce large runner usage

[lforst]

Reduces the usage of large GH runners to our "bottleneck" jobs (build & prepare e2e tests).

[github-actions]

size-limit report 📦

Path	Size
@sentry/browser (incl. Tracing, Replay, Feedback) - Webpack (gzipped)	77.35 KB (0%)
@sentry/browser (incl. Tracing, Replay) - Webpack (gzipped)	68.57 KB (0%)
@sentry/browser (incl. Tracing, Replay with Canvas) - Webpack (gzipped)	72.51 KB (0%)
@sentry/browser (incl. Tracing, Replay) - Webpack with treeshaking flags (gzipped)	62.12 KB (0%)
@sentry/browser (incl. Tracing) - Webpack (gzipped)	32.8 KB (0%)
@sentry/browser (incl. browserTracingIntegration) - Webpack (gzipped)	32.8 KB (0%)
@sentry/browser (incl. Feedback) - Webpack (gzipped)	31.01 KB (0%)
@sentry/browser (incl. sendFeedback) - Webpack (gzipped)	31.01 KB (0%)
@sentry/browser - Webpack (gzipped)	22.25 KB (0%)
@sentry/browser (incl. Tracing, Replay, Feedback) - ES6 CDN Bundle (gzipped)	75.79 KB (0%)
@sentry/browser (incl. Tracing, Replay) - ES6 CDN Bundle (gzipped)	67.42 KB (0%)
@sentry/browser (incl. Tracing) - ES6 CDN Bundle (gzipped)	33.26 KB (0%)
@sentry/browser - ES6 CDN Bundle (gzipped)	24.76 KB (0%)
@sentry/browser (incl. Tracing, Replay) - ES6 CDN Bundle (minified & uncompressed)	211.01 KB (0%)
@sentry/browser (incl. Tracing) - ES6 CDN Bundle (minified & uncompressed)	99.74 KB (0%)
@sentry/browser - ES6 CDN Bundle (minified & uncompressed)	74 KB (0%)
@sentry/browser (incl. Tracing) - ES5 CDN Bundle (gzipped)	36.32 KB (0%)
@sentry/react (incl. Tracing, Replay) - Webpack (gzipped)	68.84 KB (0%)
@sentry/react - Webpack (gzipped)	22.28 KB (0%)
@sentry/nextjs Client (incl. Tracing, Replay) - Webpack (gzipped)	85.32 KB (0%)
@sentry/nextjs Client - Webpack (gzipped)	49.66 KB (0%)
@sentry-internal/feedback - Webpack (gzipped)	17.09 KB (0%)