Allow the extensions for Visual Studio Code use Proposed API

[vitaliy-guliy]

Is your task related to a problem? Please describe

Some extensions may not work properly in the Che-Code because disabled Proposed API.

The browser console may contain the error like this

Error: Extension 'ms-python.python' CANNOT use API proposal: terminalDataWriteEvent.
Its package.json#enabledApiProposals-property declares: quickPickSortByLabel, testObserver but NOT terminalDataWriteEvent.
 The missing proposal MUST be added and you must start in extension development mode or use the following command line switch: --enable-proposed-api ms-python.python

Describe the solution you'd like

The proposed API can be enabled by adding a section to the editor product.json file.

Since it is difficult to embed changes in the editor image, we need to find a way how to update the product.json file right after workspace startup like we did for trusted extensions.

Describe alternatives you've considered

No response

Additional context

No response