Make `Run` button also work on non-js blocks

Currently Run is only available for js and go blocks.

Improved logic:

for js and go blocks - as today
for other blocks - it'll do run function with block content
if there is a selection it'll do run function with selection (even in js and go blocks)

Other solution would be a multi-stage run where we ask what the user wants to do, but that's probably worse.

When in js or go block and wants to run function over content block, Ctrl + A to select block text to force run function with selection

kjk / edna