Close the media preview screen ASAP with sending queue enabled (#4089)

* Close the attachment preview screen ASAP when sending media with the send queue is enabled

* When the send queue FF is not enabled make sure to dismiss the screen after the media has been sent

* Make sure we get a scaled thumbnail from videos too, not only for images

* Unify several state holders into `SendActionState`.

* Fix lint issues, add `Flow.firstInstanceOf` extension fun

* Update screenshots

---------

Co-authored-by: ElementBot <android@element.io>

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