Usability: Allow to Edit Workspace Commands

[tsmaeder]

In the context of adjusting the self-hosting devfiles to my concrete needs, I'd like to adjust the devfile commands, for example to use different directories.
Currently, I have to stop the workspace, change the command and restart the workspace for each change (which can be tedious especially if my changes don't immediately work)

I would propose a way to edit the commands from within the IDE. We could restrict editing in a way that makes it less likely that we break something in the devfile.

[tsmaeder]

Related: #13989

[benoitf]

@tsmaeder devfile commands are transformed into tasks and you can edit tasks ?

[tsmaeder]

@benoitf

1. will that be persisted in the devfile?
2. That link is not obvious.

[benoitf]

@tsmaeder
for 1. no

I think this issue is already handled by wider epic issue: #12709

[azatsarynnyy]

relabeled to area/plugins as it's related to https://github.com/eclipse/che-theia/tree/master/plugins/task-plugin

[che-bot]

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