Git zero config with OAuth flow

[l0rd]

Is your enhancement related to a problem? Please describe

When deploying Che there is no hint, prompt, warning that without GitHub, Gitlab or Bitbucket integration users won't be able to connect their accounts.

When logging in there is no option to link/unlink the current user with GitHub, Gitlab or Bitbucket.

When starting a workspace there is no warning that git UX will be deteriorated if there is no link with the repo git provider

Describe the solution you'd like

• Workspace startup
  Create or update local git config when user changes Che Theia git settings  #21115
  Use OAuth flow and authenticate users against Git services at first workspace startup #21346
  Provision git name or email with data from personal access tokens #20938
  Provision git name or email with OIDC data #20937
• Git services
  • Private GitLab repositories: OAuth2 flow fails in devworkspace mode (without Keycloak) #21231
  • Support OAuth flow for Bitbucket SaaS #21517
  • Support OAuth flow for GitHub Enterprise Server #21485
  • When the git repository is on gitlab.com .che/che-editor.yaml is ignored #21562
  • Resolve Devfiles from private GH/BB/Gitlab repos even if Che OAuth App is not configured #21189
• Dashboard
  • Add "Git Services" tab to the User Preferences #21595
• Deployment
  • Allow to configure git services in Che configuration #21577

[l0rd]

Related to #13611

[l0rd]

Removing those 2 tasks from this epic and closing it

• Testing Git zero-config flow as PR checks #21753
• Periodically refresh git OAuth2-tokens for GitLab and Bitbucket (expiration 2h) #21291