test(replay): Test replay recording across multiple pages and navigations

[Lms24]

This PR adds a Playwright integration test to test replay recording data across multiple pages, therefore, kind of simulating an actual user session. Specifically, we check that for each navigation that we send

• the correct performance spans
• the correct breadcrumbs
• correct full and incremental DOM snapshots

To properly test multi-page app navigations, this PR modifies our playwright setup so that we can now have multiple html pages in one test case (see adjusted README section, how this works).

Given that #7145 made snapshot testing easier, I opted to snapshot-test the DOM checkouts and updates.

ref #7044

[github-actions]

size-limit report 📦

Path	Size
@sentry/browser - ES5 CDN Bundle (gzipped + minified)	20.05 KB (-0.01% 🔽)
@sentry/browser - ES5 CDN Bundle (minified)	62.14 KB (0%)
@sentry/browser - ES6 CDN Bundle (gzipped + minified)	18.68 KB (-0.01% 🔽)
@sentry/browser - ES6 CDN Bundle (minified)	55.29 KB (0%)
@sentry/browser - Webpack (gzipped + minified)	20.41 KB (0%)
@sentry/browser - Webpack (minified)	66.73 KB (0%)
@sentry/react - Webpack (gzipped + minified)	20.44 KB (0%)
@sentry/nextjs Client - Webpack (gzipped + minified)	47.78 KB (0%)
@sentry/browser + @sentry/tracing - ES5 CDN Bundle (gzipped + minified)	26.93 KB (-0.01% 🔽)
@sentry/browser + @sentry/tracing - ES6 CDN Bundle (gzipped + minified)	25.2 KB (0%)
@sentry/replay ES6 CDN Bundle (gzipped + minified)	42.57 KB (-0.01% 🔽)
@sentry/replay - Webpack (gzipped + minified)	36.78 KB (0%)
@sentry/browser + @sentry/tracing + @sentry/replay - ES6 CDN Bundle (gzipped + minified)	60.2 KB (0%)
@sentry/browser + @sentry/replay - ES6 CDN Bundle (gzipped + minified)	53.8 KB (-0.01% 🔽)

[mydea]

wow, this is really cool! Great test to really check actual user behavior 🎉