Users clicking cancel, should kill move2kube instance and restart next time somebody invokes it.

[ashokponkumar]

Is your feature request related to a problem? Please describe.
In the backend currently the move2kube service keeps running, even if we select cancel. And even when restarting server. This might not be necessary with konveyor/move2kube-api#50

Describe the solution you'd like
If konveyor/move2kube-api#50 is fixed, killing move2kube instance when cancel is pressed is better, since it saves resources, and restarts only when required. Will help move2kube scale better.

[HarikrishnanBalagopal]

Cancelling transformation also allows deletion of projects and workspaces while transformation is ongoing