VideoPress: register block type with block metadata (#33701)

* add early return if the block is already registered

* register block and use returned value to get editor script handle, needed to render the initial state script (Connection_Initial_State) properly

* remove old registration method

* use file paths on block.json instead of script handles

* changelog

* fix versions

Committed via a GitHub action: https://github.com/Automattic/jetpack/actions/runs/6618761634