Add control for when to run queries

[sstults-non-empl]

Is your feature request related to a problem? Please describe.
There are several circumstances where having the queries automatically refresh their results is not desirable. One example is where there is a large case and we exceed the queries-per-second throttle between Quepid and the search engine. Another example is when heavy load causes instability in a non-production search engine.

Describe the solution you'd like
I would like to have two options to control when queries are run. The first is a toggle and a button at the top of the case. When the toggle is off queries aren't automatically run and the button runs them.

The second control I would like to have is the ability to re-run individual queries. This would help instances where most of the case ran but there were a couple of timeouts or other related temporary errors.

Describe alternatives you've considered

1. Break large cases up into smaller ones
2. Keep re-running the case until the whole thing succeeds
3. Beef up intermediate environments so that they can handle whatever load we throw at them