CloudShell workspace does not work in multiuser mode anymore

[sleshchenko]

Describe the bug

CloudShell workspace does not work in multiuser mode anymore.
It's caused by the fact that JWTProxy now tries to connect to machine-exec via 127.0.0.1 but che-machine-exec is not configured in that way.

It's quite easy to prepare to fix for it by reconfiguring cloud-shell editor in plugin-registry as it's done for terminal plugin eclipse-che/che-plugin-registry#378 but then it won't work in SingleUser Che

JWTProxy is reconfigured in #15890

Che version

• latest
• nightly
• other: please specify

Steps to reproduce

Just try to create and start a workspace with cloud-shell editor on MultiUser Che.

Runtime

Does not matter

Installation method

Does not matter

Environment

Does not matter

[sleshchenko]

@rhopp Do you think we could create a small test in our selenium test-suite to prevent bugs in the future?

[AndrienkoAleksandr]

Closed can't reproduce.