[Dev Console] Make dev console send request button available while scrolling down

[shahzad31]

Describe the feature:

Dev console query Send request button is only available at the top

if i have scrolled down and i am modifying query, i also have to scroll back to top for the long query to send request, it seems very annoying, perhaps keyboard shortcut can be used but it's annoying as mouse action to scroll

Describe a specific use case for the feature:

Please make the Send request button always available on the hover.

[elasticmachine]

Pinging @elastic/kibana-management (Team:Kibana Management)