Add a way to reject the authorisation opt-out flag from the dashboard

[vinokurig]

Is your task related to a problem? Please describe

when eclipse-che/che-server#576 is merged, the only way to reject the authorisation opt-out flag would be manually editing the workspace-preferences config-map.

Describe the solution you'd like

Update the Git Services tab of the User Preferences dashboard page:

• When an SCM authorisation is rejected add the corresponding item to the Git Services tab.
• The tab should have some additional label to mark it as an authorisation reject item.
• When the workspace create/start page is reloaded after the authorisation reject (url with the error_code=access_denied query parameter) show a notification with the description that the authorisation page will not appear for the specific SCM provider, and some instructions how to revert the option back from the Git Services tab.

Describe alternatives you've considered

No response

Additional context

No response

[akurinnoy]

Hi @vinokurig @olexii4,

Please have a look at the picture below - that is how I believe the git services page may look like:

Mockups

cc @ibuziuk