Feature request: switch to easily and temporarily disable scheduled speedtest

[xathon]

Is your feature request related to a problem? Please describe.
When I want to upload or download a big amount of data, I want to have all the available bandwidth for that operation, without my scheduled speedtest hugging the wire.

Describe the solution you'd like
I'd love a button on the dashboard to quickly toggle on/off the scheduled speedtest. Maybe even a "Turn of scheduled speedtest for 1 hour/day/week/custom" selector.

Additional context
It might be helpful to be able to toggle to send out a notification when the schedule is stopped and resumed.

[alexjustesen]

Linking to #1351