Che: Make Kubernetes infrastructure create a special service account for workspaces

[sleshchenko]

Description

If Kubernetes infrastructure creates a namespace for workspace then special service account (with view and exec rights) should be created there, otherwise, Tasks and Exec sidecars will fail because of permissions leaks. The same is done for OpenShift infrastructure https://github.com/eclipse/che/pull/11199

It depends on upgrading fabric8-kubernetes-client version to v.4.0.4 #11112

OS and version:

Diagnostics:

[l0rd]

@skabashnyuk @sleshchenko is there any chance to work on this issue in current sprint?

[sleshchenko]

@AndrienkoAleksandr Could you please update README.md file in che-exec-terminal plugin since this issue is closed and Terminal and Exec should work fine on both of listed helm chart configurations https://github.com/ws-skeleton/che-machine-exec.

[AndrienkoAleksandr]

@sleshchenko thanks, I will update README.md file.