Support embedding of the Element Call assets within a widget host

[hughns]

This only needs to support Element Call running as a widget (not standalone).

Specific scenarios that we want to support:

• a npm package for consumption in a web application such as Element Web
• a Maven package for consumption in an Android app such as Element X Android
• a SwiftPM package for consumption in an iOS app such as Element X iOS

Pull requests:

• Cleanup GitHub Actions #2983
• Don't produce compressed assets at build time and instead do it as part of the nginx build #2995
• Use fetch() in a way that works for file URLs #3071
• Don't include sentry in release builds #3073
• Fix typing on config: EULA is optional as it has a default #3074
• Vite embedded build of Element Call #3077
• Publish embedded package for releases of Element Call #3086
• Analytics configuration is the responsibility of the host application when running in widget mode #3089

[hughns]

Work in progress is visible at livekit...hughns:element-call:publishing