[fb] Skip current folder on select all

Added logic to skip current folder from the select all action
Disabled copy/rename/move/trash if the current folder is selected
HUE-2255 [fb] Drag and drop a file directly into the page

Enabled dragging files into browser for upload utilizing drop-zone
Created opaque layover for messaging (i.e., 'Drop files anywhere')
Added styles for upload status template to space out the pieces of information
Added feature test before deploying drag and drop upload
Merge remote-tracking branch 'remotes/origin/HUE-2255-dragAndDropUploads' into HUE-2255-dragAndDropUploads