fix: list all DevWorkspaces, handle inaccessible templates gracefully (CRW-11897)

[adietish]

fixes https://redhat.atlassian.net/browse/CRW-11897

In this PR we're listing all workspaces regardless of editor. We only allow to connect to workspaces with JetBrains or unknown editors though

How to test:

1. EXEC: create several workspaces with different editors (vscode, jetbrains pycharm/golang/ultimate/..., editor definition
2. EXEC: launch plugin, connect to cluster and proceed to the list of workspaces
3. EXEC: try connecting to the different workspaces
4. ASSERT: you can only connect to jetbrains editor based workspaces and the unknown ones (ws created with an editor definition). With the unknown editor workspace you are warned that connecting may fail.

[coderabbitai]

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[codecov-commenter]

Codecov Report

❌ Patch coverage is 42.10526% with 297 lines in your changes missing coverage. Please review.
✅ Project coverage is 38.30%. Comparing base (71098f6) to head (0424a3b).
⚠️ Report is 422 commits behind head on main.

Files with missing lines	Patch %	Lines
.../gateway/view/steps/DevSpacesWorkspacesStepView.kt	0.00%	89 Missing ⚠️
...ateway/view/steps/workspaces/DevWorkspacesTable.kt	0.00%	61 Missing ⚠️
...tlin/com/redhat/devtools/gateway/DevSpacesIcons.kt	0.00%	31 Missing ⚠️
...steps/workspaces/DevWorkspaceTableCellRenderers.kt	0.00%	31 Missing ⚠️
...s/gateway/view/steps/workspaces/WorkspacesWatch.kt	0.00%	27 Missing ⚠️
...ay/view/steps/workspaces/DevWorkspaceTableModel.kt	78.00%	7 Missing and 4 partials ⚠️
...ateway/devworkspace/WorkspaceEditorInfoProvider.kt	86.84%	2 Missing and 8 partials ⚠️
.../redhat/devtools/gateway/server/RemoteIDEServer.kt	41.17%	7 Missing and 3 partials ⚠️
...lin/com/redhat/devtools/gateway/view/ui/Dialogs.kt	0.00%	10 Missing ⚠️
.../com/redhat/devtools/gateway/view/ui/SwingUtils.kt	0.00%	7 Missing ⚠️
... and 5 more

Additional details and impacted files

@@            Coverage Diff             @@
##            main     #359       +/-   ##
==========================================
+ Coverage   0.00%   38.30%   +38.30%     
==========================================
  Files          4      121      +117     
  Lines         26     5289     +5263     
  Branches       0     1014     +1014     
==========================================
+ Hits           0     2026     +2026     
- Misses        26     2984     +2958     
- Partials       0      279      +279     

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[adietish]

@azatsarynnyy, @vrubezhny, @msivasubramaniaan: please review