Add gl-project-policy-delegate

Add gl-project-policy-delegate

Used for:

• Used in the policy-factory which manages all things for being able to access and load groups/rooms, etc
• Invites, modules/permissions/lib/add-invite-policy-factory.js#L42-48
• For finding admin groups that you can create a room in. Used in the create room modal, modules/permissions/lib/security-descriptor-admin-filter.js

Part of https://gitlab.com/gitlab-org/gitter/webapp/issues/2411

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Other MR where we added gl-group-policy-delegate, https://gitlab.com/gitlab-org/gitter/webapp/-/merge_requests/1679

Todo

• Blocked by https://gitlab.com/gitlab-org/gitter/webapp/-/merge_requests/1781