Do not ask user in which container run command if it could be figured out from the workspace panel tree

[mmorhun]

Description

If a command doesn't declare container in which it should be run, we ask user to choose.
In case if user chooser such a command under some specific machine in workspace panel we shouldn't ask, but use the container on which it was invoked.

Reproduction Steps

1. Create a devfile, define a command, but do not define container for it.
2. Create a workspace from the devfile and start it.
3. Open workspace panel, navigate to a container and click on the command.

Expected: the command should be run in the container on which this command was invoked
Actual: user is asked about container in which the command should be run.

[mmorhun]

Done