Failed to debug java spring sample with devworkspace engine

[sleshchenko]

Describe the bug

Failed to debug java spring sample with devworkspace engine.

Che version

next (development version)

Steps to reproduce

1. Deploy Che with devworkspace engine.
2. Create workspace with https://github.com/musienko-maxim/java-spring-petclinic/tree/devfilev2
3. Build and try to debug app

Expected behavior

It works

Runtime

OpenShift, minikube

Screenshots

Installation method

chectl/next

Environment

Linux

Eclipse Che Logs

2021-09-24 11:05:06.576 root ERROR Error starting the debug session Params: Error: It is not possible to provide debug adapter executable.
    at DebugExtImpl.<anonymous> (/remote-endpoint/node_modules/@theia/plugin-ext/lib/plugin/node/debug/debug.js:723:39)
    at step (/remote-endpoint/node_modules/@theia/plugin-ext/lib/plugin/node/debug/debug.js:33:23)
    at Object.next (/remote-endpoint/node_modules/@theia/plugin-ext/lib/plugin/node/debug/debug.js:14:53)
    at fulfilled (/remote-endpoint/node_modules/@theia/plugin-ext/lib/plugin/node/debug/debug.js:5:58)
    at runMicrotasks (<anonymous>)
    at processTicksAndRejections (internal/process/task_queues.js:97:5)

### Additional context

_No response_

[svor]

To start java debug need to have vscode-java in standard mode, it should be activate automatically by this preference in plugin's meta.yaml:
java.server.launchMode: Standard
currently we have a problem with it: Preferences from the plugin are not applied for the workspace.

[svor]

blocked by #20559

[svor]

Should work now