Resources Monitor Plugin doesn't work when devWorkspace engine is enabled

[svor]

Describe the bug

Resources Monitor plugin doesn't display information about the pod's resources when the workspace is running.

Che version

7.39@latest

Steps to reproduce

1. Deploy che with dev-workspace engine
2. Start any workspace
3. Look at status bar where should be displayed an information from the Resources Monitor plugin

Expected behavior

Information about resources should be displayed in the status bar

Runtime

OpenShift

Screenshots

No response

Installation method

chectl/next

Environment

Linux

Eclipse Che Logs

Extension-Host:With stack trace: Error: Cannot get workspace pod. HttpError: HTTP request failed
    at ResourceMonitor.getWorkspacePod (/tmp/theia-unpacked/eclipse_che_resource_monitor_plugin.theia/lib/resource-monitor.js:67:19)
    at processTicksAndRejections (internal/process/task_queues.js:97:5)
Extension-Host:Promise rejection not handled in one second: TypeError: Cannot read property 'attributes' of undefined , reason: TypeError: Cannot read property 'attributes' of undefined
Extension-Host:With stack trace: TypeError: Cannot read property 'attributes' of undefined
    at DevfileHandler.isRecommendedExtensionsDisabled (/tmp/theia-unpacked/eclipse_che_recommendations_plugin.theia/lib/devfile/devfile-handler.js:31:36)
    at processTicksAndRejections (internal/process/task_queues.js:97:5)
    at async RecommendationsPlugin.start (/tmp/theia-unpacked/eclipse_che_recommendations_plugin.theia/lib/plugin/recommendations-plugin.js:47:26)

Additional context

The problem could be related to a mechanism which is used in ResMonitor plugin to get an information about workspace's pod. As an alternative we can try to reuse k8s-devfile-service api.

But it's important to check that it'll work when devWS engine is not enabled.

[svor]

I've fixed a problem with reading workspace pod information by setting right name of workspace's namespace.
The next problem is related to workspace SA, it's not possible to read metrics:

{"kind":"Status","apiVersion":"v1","metadata":{},"status":"Failure","message":"pods.metrics.k8s.io "workspace4f756f319b3f4555-5f8b6bdff4-ktp5k" is forbidden: User "system:serviceaccount:opentlc-mgr-che:workspace4f756f319b3f4555-sa" cannot get resource "pods" in API group "metrics.k8s.io" in the namespace "opentlc-mgr-che"","reason":"Forbidden","details":{"name":"workspace4f756f319b3f4555-5f8b6bdff4-ktp5k","group":"metrics.k8s.io","kind":"pods"},"code":403}

[amisevsk]

PR devfile/devworkspace-operator#695 adds get/list/watch permissions for pod metrics in the workspace ServiceAccount.

[svor]

Fixed by eclipse-che/che-theia#1269 and devfile/devworkspace-operator#695

[benoitf]

moving issue to 7.42 milestone as this issue is part of the endgame

[svor]

depends on devworkspace-operator v0.12.0 devfile/devworkspace-operator#695

[svor]

Works on https://che-dogfooding.apps.che-dev.x6e0.p1.openshiftapps.com/ instance