ci: Add fail-fast: false to playwright tests

[lforst]

Only some of the playwright jobs seem to fail in the installation step and if one of them fails they cancel the other ones making it very unlikely that we will ever get CI to pass.

This is not a fix but a workaround until we understand why CI fails so often.

[github-actions]

size-limit report 📦

Path	Size
@sentry/browser - ES5 CDN Bundle (gzipped + minified)	19.84 KB (-0.01% 🔽)
@sentry/browser - ES5 CDN Bundle (minified)	61.46 KB (0%)
@sentry/browser - ES6 CDN Bundle (gzipped + minified)	18.62 KB (+0.01% 🔺)
@sentry/browser - ES6 CDN Bundle (minified)	55 KB (0%)
@sentry/browser - Webpack (gzipped + minified)	20.38 KB (0%)
@sentry/browser - Webpack (minified)	66.55 KB (0%)
@sentry/react - Webpack (gzipped + minified)	20.4 KB (-0.01% 🔽)
@sentry/nextjs Client - Webpack (gzipped + minified)	47.63 KB (-0.01% 🔽)
@sentry/browser + @sentry/tracing - ES5 CDN Bundle (gzipped + minified)	26.82 KB (+0.03% 🔺)
@sentry/browser + @sentry/tracing - ES6 CDN Bundle (gzipped + minified)	25.25 KB (-0.01% 🔽)
@sentry/replay ES6 CDN Bundle (gzipped + minified)	43.05 KB (-0.01% 🔽)
@sentry/replay - Webpack (gzipped + minified)	38.3 KB (0%)