feat(bundles): Ensure CDN bundles always have a Replay export

[mydea]

This makes sure we export Replay in CDN bundles that do not include the actual Replay code.
This will export a minimal shim that covers the public API we have, and logs a message.

If we think that's good, we can look to use a similar approach for BrowserTracing (TBD - this is a bit different, but let's see).

Nicely, we can actually cover this quite well with our playwright tests 🎉

Closes #7393

[Lms24]

Generally this LGTM. I think the build error is related to the tracing bundle not being able to resolve the relative path to the shim file.

I guess the one downside here is that this increases the bundle size of the non-replay bundles somewhat unnecessarily. But I understand that this is the lesser of two evils 😅

[github-actions]

size-limit report 📦

Path	Size
@sentry/browser - ES5 CDN Bundle (gzipped + minified)	20.4 KB (+0.71% 🔺)
@sentry/browser - ES5 CDN Bundle (minified)	63.27 KB (+0.47% 🔺)
@sentry/browser - ES6 CDN Bundle (gzipped + minified)	18.98 KB (+0.51% 🔺)
@sentry/browser - ES6 CDN Bundle (minified)	56.18 KB (+0.53% 🔺)
@sentry/browser - Webpack (gzipped + minified)	20.64 KB (0%)
@sentry/browser - Webpack (minified)	67.41 KB (0%)
@sentry/react - Webpack (gzipped + minified)	20.66 KB (0%)
@sentry/nextjs Client - Webpack (gzipped + minified)	48.55 KB (0%)
@sentry/browser + @sentry/tracing - ES5 CDN Bundle (gzipped + minified)	27.64 KB (+0.44% 🔺)
@sentry/browser + @sentry/tracing - ES6 CDN Bundle (gzipped + minified)	25.91 KB (+0.52% 🔺)
@sentry/replay ES6 CDN Bundle (gzipped + minified)	43.17 KB (0%)
@sentry/replay - Webpack (gzipped + minified)	37.19 KB (0%)
@sentry/browser + @sentry/tracing + @sentry/replay - ES6 CDN Bundle (gzipped + minified)	61.2 KB (+0.01% 🔺)
@sentry/browser + @sentry/replay - ES6 CDN Bundle (gzipped + minified)	54.37 KB (+0.01% 🔺)