chore(replay): Use Monorepo's toplevel .npmignore

[Lms24]

This PR removes Replay's empty .npmignore file as we can use the monorepo's top-level .npmignore file. When running build:npm, this top-level ignore file is copied into the build/npm directory where it is used to control what's going into the NPM tarball. Because the Replay package now has the same contents and structure as all our other packages, we don't need a package-specific ignore file.

ref #6280

[github-actions]

size-limit report 📦

Path	Size
@sentry/browser - ES5 CDN Bundle (gzipped + minified)	19.57 KB (-0.01% 🔽)
@sentry/browser - ES5 CDN Bundle (minified)	60.59 KB (0%)
@sentry/browser - ES6 CDN Bundle (gzipped + minified)	18.36 KB (+0.02% 🔺)
@sentry/browser - ES6 CDN Bundle (minified)	54.15 KB (0%)
@sentry/browser - Webpack (gzipped + minified)	20.12 KB (0%)
@sentry/browser - Webpack (minified)	65.75 KB (0%)
@sentry/react - Webpack (gzipped + minified)	20.14 KB (0%)
@sentry/nextjs Client - Webpack (gzipped + minified)	45.99 KB (0%)
@sentry/browser + @sentry/tracing - ES5 CDN Bundle (gzipped + minified)	26.45 KB (-0.01% 🔽)
@sentry/browser + @sentry/tracing - ES6 CDN Bundle (gzipped + minified)	24.88 KB (+0.02% 🔺)
@sentry/replay index.js	37.2 KB (0%)
@sentry/replay - Webpack (gzipped + minified)	37.17 KB (0%)
@sentry/replay - Webpack (minified)	124.99 KB (0%)