Test UX of an upgrade to Che7 from the running Che6 workspace perspective

[skabashnyuk]

Is your task related to a problem? Please describe.

The need to verify UX of running Che6 workspace when upgrade to che 7 has happened.

• What user will see?
• Does this screen contain a link to the documentation that explains what to do next?
• Does this link configurable?

Describe the solution you'd like

• Setup che6
• Run workspace
• run an upgrade to che7
• Check UX.

Describe alternatives you've considered

none

Additional context

Continuation of #14200

[mshaposhnik]

To perform tests, Che6 was started using both latest and Che-6 based 1.22.GA Che operator , but che image fields in CR file was patched to use 6.19.0 version:

• cheImageTag: '6.19.0'

Start command:
chectl server:start --installer=operator --platform=minishift --che-operator-cr-yaml=/home/Makis/projects/che/org_v1_che_cr.yaml

After that, Che6 was succesfully deployed and workspace succesfully started.

Upgrade to Che7
Upgrade was executed by changing Operator version to nightly and using patch command to update necessary images:

oc patch checluster eclipse-che --type=json -p '[{"op": "replace", "path": "/spec/server/cheImageTag", "value": "nightly"}, {"op": "replace", "path": "/spec/server/pluginRegistryImage", "value": "quay.io/eclipse/che-plugin-registry:nightly"}]' -n che

UX after update:
✔️ Workspaces was functional during update.

⚠️ Workspace were unable to open new terminal window due to lost websocket connection:

⚠️ After page reload, Che 6 workspace won't load anymore (but still running):

✔️ UD shows the warning about workspace upgrade needed:

✔️ Documentation link on how to update workspace is working OK

✔️ Newly created devfile-based Che7 workspaces are working just fine:

[mshaposhnik]

@nickboldt About the workspace updgrate docs link, it looks like the it can be overriden in
/assets/branding/product.json line 26:

"docs" : {
       "devfile" : "/docs/che-7/using-developer-environments-workspaces.html#making-a-workspace-portable-using-a-devfile_using-developer-environments-workspaces",
       "workspace" : "/docs/what-are-workspaces.html",
       "factory" : "/docs/factories-getting-started.html",
       "organization": "/docs/organizations.html",
>>     "converting": "/docs/che-7/converting-a-che-6-workspace-to-a-che-7-devfile/",
       "general": "/docs"
  }