Add 'experimental' placeholder to the passphrase

[ibuziuk]

What does this PR do?

See devfile/devworkspace-operator#1337 (comment)

Screenshot/screencast of this PR

What issues does this PR fix or reference?

Related to devfile/devworkspace-operator#1337

Is it tested? How?

Release Notes

Docs PR

[che-bot]

Click here to review and test in web IDE:

[github-actions]

Docker image build succeeded: quay.io/eclipse/che-dashboard:pr-1249

kubectl patch command

kubectl patch -n eclipse-che "checluster/eclipse-che" --type=json -p="[{"op": "replace", "path": "/spec/components/dashboard/deployment", "value": {containers: [{image: "quay.io/eclipse/che-dashboard:pr-1249", name: che-dashboard}]}}]"

[dmytro-ndp]

Good idea, IMHO

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.94%. Comparing base (3d3945d) to head (14bfb6d).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1249      +/-   ##
==========================================
- Coverage   90.09%   89.94%   -0.15%     
==========================================
  Files         445      445              
  Lines       46094    46094              
  Branches     3129     3097      -32     
==========================================
- Hits        41527    41458      -69     
- Misses       4531     4598      +67     
- Partials       36       38       +2     

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[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: dmytro-ndp, ibuziuk, olexii4

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[vinokurig]

From the discussion we agreed only to mark the injection of the SSH agent postStart event as experimental. The SSH agent post start event is needed only for the SSH flow from terminal, so disabling the particular feature will not affect the rest ssh features e.g. start workspace from ssh url or git remote operations from che-code. So I would rather add some documentation regarding the SSH flow from terminal e.g. we need to enable DWO experimental features to have this feature.