Add additional field to devworkspace status for showing info to users

[amisevsk]

What does this PR do?

Adds a field to the status subresource of DevWorkspaces which can be used to provide additional information about e.g. workspace failures and is printed in the short-form output of commands like kuberctl get devworkspaces

What issues does this PR fix or reference?

Resolves #220, but should not be merged without discussion in the issue. I just wrote the PR since it's no effort to implement.

Is your PR tested? Consider putting some instruction how to test your changes

When applied to a cluster, output of kubectl get devworkspaces is something like

kc get devworkspace
NAME    WORKSPACE ID                PHASE    INFO   URL
theia   workspaceb8b430aa340343da   Failed

(propagating failure reason to the status is not yet implemented on the controller side)

[davidfestal]

see my comment on the issue: #220 (comment) about trying to be consistent with the corresponding fields in PodStatus for example ?

[amisevsk]

@davidfestal Finally got around to updating this PR :)

[amisevsk]

The conversion tests, as if to tell me they're actually useful, found a bug in conversion :). It is fixed now.

[sleshchenko]

LGTM, just one question left

[amisevsk]

The output for the current state of this PR is

NAME    WORKSPACE ID                PHASE      INFO   URL
theia   workspace210c0f0d88854521   Starting          http://workspace210c0f0d88854521-theia-3100.192.168.49.2.nip.io

Ideally we would be able to hide empty fields; I'm also considering moving INFO to be last in the list, but that may be confusing.

Failed workspaces still do not put anything there, as the changes aren't implemented in the controller.

[amisevsk]

cc: @davidfestal waiting on your re-review

[openshift-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: amisevsk, davidfestal, sleshchenko
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[openshift-ci-robot]

New changes are detected. LGTM label has been removed.