Manage install from vsix using mounting ConfigMap to the file system

[RomanNikitenko]

What does this PR do?

Adds the ability to disable 'Install from VSIX' command.
It uses Config Map approach. The ConfigMap should be created in the eclipse-che namespace, see https://eclipse.dev/che/docs/stable/administration-guide/configuring-a-user-namespace/

I tested if it's possible to override the configuration in user's namespace when the ConfigMap is created in the eclipse-che namespace:

Edit_ConfigMap.mov

What issues does this PR fix?

https://issues.redhat.com/browse/CRW-8313

How to test this PR?

Prerequisites

• Add a ConfigMap with a configuration for the Install from VSIX command.
  The best way for testing - adding of the ConfigMap in the eclipse-che namespace. In this case the ConfigMap is replicated to every user namespace. The content is:

kind: ConfigMap
apiVersion: v1
metadata:
  name: vscode-editor-configurations
  namespace: eclipse-che
  labels:
    app.kubernetes.io/part-of: che.eclipse.org
    app.kubernetes.io/component: workspaces-config
    controller.devfile.io/mount-to-devworkspace: 'true'
    controller.devfile.io/watch-configmap: 'true'
  annotations:
    controller.devfile.io/mount-as: file
    controller.devfile.io/mount-path: /checode-config
    controller.devfile.io/read-only: 'true'
data:
  configurations.json: |
    {
      "extensions.install-from-vsix-enabled": false
    }

If you prefer to add the ConfigMap directly in your namespace, the content is:

kind: ConfigMap
apiVersion: v1
metadata:
  name: vscode-editor-configurations
  labels:
    controller.devfile.io/mount-to-devworkspace: 'true'
    controller.devfile.io/watch-configmap: 'true'
  annotations:
    controller.devfile.io/mount-as: file
    controller.devfile.io/mount-path: /checode-config
    controller.devfile.io/read-only: 'true'
data:
  configurations.json: |
    {
      "extensions.install-from-vsix-enabled": false
    }

• Add the following configmap to your namespace:

kind: ConfigMap
apiVersion: v1
metadata:
  name: default-extensions
  labels:
    controller.devfile.io/mount-to-devworkspace: 'true'
    controller.devfile.io/watch-configmap: 'true'
  annotations:
    controller.devfile.io/mount-as: env
data:
  DEFAULT_EXTENSIONS: '/tmp/atlassian.atlascode-3.0.10.vsix;/tmp/snowflake.snowflake-vsc-1.9.1.vsix'

• Start a workspace https://devspaces.apps.rm1.0a51.p1.openshiftapps.com/dashboard/#/https://github.com/RomanNikitenko/web-nodejs-sample/tree/install-from-vsix-disabled

Use cases for testing:

Command Palette does not contain "Install from VSIX" command

• F1 => start typing Install from
• check list of the filtered commands
• Install from VSIX command should be absent

"Extensions" panel does not contain "Install from VSIX" action

• F1 => Open View => Extensions
• click ... on the view (Views and More Actions)
• Install from VSIX action should be absent

"Install Extension VSIX" action should be absent in the Explorer's context menu

• Go to the Explorer
• find a file with the vsix extension
• open the context menu for that file
• Install from VSIX action should be absent

It's not possible to install VSIX extensions using "default extensions" functionality

• see details about "default extensions" functionality Launching vscode with some default extensions installed che-incubator/che-code#424

• default-extensions ConfigMap (see above) + the corresponding sections in the devfile allows to install defined in the devfile extensions. Check that it's not possible when extensions.install-from-vsix-enabled": false is defined in the vscode-editor-configurations ConfigMap

• Notification should be displayed when the workspace is started

• No installed extensions in the Extensions panel

Does this PR contain changes that override default upstream Code-OSS behavior?

• the PR contains changes in the code folder (you can skip it if your changes are placed in a che extension )
• the corresponding items were added to the CHANGELOG.md file
• rules for automatic git rebase were added to the .rebase folder

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