allow disconnect for org owned users

[selfcontained]

Description

Allow org owned users to disconnect all git providers.

Related Issue(s)

Fixes WEB-619

How to test

To test this you can join my org on the preview env. w/ your google login by following this link:

https://brad-web-6a8b1c5163c.preview.gitpod-dev.com/login/brad

• Go to User Settings / Git Providers and connect to a provider.
• Verify you can disconnect from that provider even though it's the only connection you have.

Documentation

Preview status

Gitpod was successfully deployed to your preview environment.

• 🏷️ Name - brad-web-6a8b1c5163c
• 🔗 URL - brad-web-6a8b1c5163c.preview.gitpod-dev.com/workspaces.
• 📚 Documentation - See our internal documentation for information on how to interact with your preview environment.
• 📦 Version - brad-web-619-allow-sso-users-to-remove-all-their-git-provider-connections-gha.13125

Build Options

Build

• /werft with-werft
  Run the build with werft instead of GHA
• leeway-no-cache
• /werft no-test
  Run Leeway with --dont-test

Publish

• /werft publish-to-npm
• /werft publish-to-jb-marketplace

Installer

• analytics=segment
• with-dedicated-emulation
• workspace-feature-flags
  Add desired feature flags to the end of the line above, space separated

Preview Environment

• /werft with-local-preview
  If enabled this will build install/preview
• /werft with-preview
• /werft with-large-vm
• /werft with-gce-vm
  If enabled this will create the environment on GCE infra
• with-integration-tests=all
  Valid options are all, workspace, webapp, ide, jetbrains, vscode, ssh

/hold

[svenefftinge]

We should check this on the server side. But we can do that later as the current check is also done client side.

[svenefftinge]

I'm unholding because the fix is good and the testing issues seem unrelated.

/unhold