Debounce subscription requests?

[hjoliver]

Whenever data requirements change, a new request is issue to update the merged subscription.

After much discussion (sorry @kinow 😁 ) we have identified at least one scenario where this might need debounce: user quickly clicks on multiple suites in the gscan sidebar, one after the other (potentially with mulitple tabs open in the workflows view too).

Ref #388 and #373

[kinow]

Note to self/later: filtering is normally implemented in JS with debounce. I have not added it as we don't have debounce anywhere in the code (except in the Graph component I think). Leaving it for later if necessary, after discussion, etc