Scroll with content as more output is logged to the UI terminal

[glennmusa]

Benefit/Result/Outcome
Today the Execute Terraform output is rendered in the UI from the `$("#terminal") element but quickly flows out of the viewport and continues to flow out of the viewport requiring an end-user to interact with the screen to check on deployment progress.

Description
It'd be nice if that as output was written to the element, the element automatically scrolled to the bottom so that the user doesn't need to interact with the screen to check on deployment progress.

This could probably be achieved with jQuery's scrollTop() method passing in the element's scrollHeight property.

Acceptance Criteria

• the UI's terminal element automatically scrolls as subshell output is added to it