Remove old requirements dropzonejs, embed, ... and old view modes

This is where entity_browser is still used. I guess we could remove it entirely, now that media_browser is also used for slideshows and slides!

https://git.drupalcode.org/search?search=entity_browser&nav_source=navba...

Let's better solve this separately in the follow-up: 📌 Remove entity_browser dependency, now where media_browser is used everywhere. Fixed

I'll leave this open to check for other old dependencies, but hopefully we'll be done here soon.

Further candidates to check for removal:

1. metatag
2. pathauto
3. views_linkarea

#24 are for better UX and defaults. I think we can keep them.

Many unneeded dependencies were removed in 4.x so we can close this fixed :)

Automatically closed - issue fixed for 2 weeks with no activity.