Support restricting OAuth tokens to specific projects and groups

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Extending the work to limit personal access tokens to specific projects https://gitlab.com/gitlab-org/gitlab-ce/issues/20993 and groups https://gitlab.com/gitlab-org/gitlab-ce/issues/45967, we should add support for OAuth workflows too.

Proposal

1. Click OAuth button in some external app
2. Redirected to GitLab to confirm or reject, and select which projects/groups to give access
3. From /profile/applications the user can add or remove projects/groups from the list at any time

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