Ability to duplicate an existing check

[peterschretlen]

What would you like to be added:

Many checks have nearly identical configuration, and differ only by a single value. For example I might have 10 HTTP checks that use the same set of probes, HTTP configurations, and labels, but differ only by the target (instance value).

Having an option to "duplicate" or "copy" an existing check would make it easier to quickly create a set of checks with uniform configuration.

Why is this needed:

In the UI today, if you want create two checks with identical settings, you must go through the entire check creation flow twice and set all the same configurations.

Internal reference to this enhancement request: https://grafana.zendesk.com/agent/tickets/166402

[peterschretlen]

We expect a similar "draft" workflow integration will be needed for k6-studio integration.