Add GL_PROJECT support to the permissions view

Add GL_PROJECT support to the permissions view

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

Other MR where we added GL_GROUP support to the permissions view: https://gitlab.com/gitlab-org/gitter/webapp/-/merge_requests/1763

Testing strategy

1. Insert a new GitLab Gitter group into Mongo

   db.groups.insert({
           "name" : "gitlab-org-gitter-webapp",
           "uri" : "gitlab-org-gitter-webapp",
           "lcUri" : "gitlab-org-gitter-webapp",
           "lcHomeUri" : "gitlab-org-gitter-webapp/home",
           "homeUri" : "gitlab-org-gitter-webapp/home",
           "sd" : {
                   "externalId" : "3601513",
                   "linkPath" : "gitlab-org/gitter/webapp",
                   "public" : true,
                   "admins" : "GL_PROJECT_MAINTAINER",
                   "members" : "PUBLIC",
                   "type" : "GL_PROJECT"
           },
   });

2. Insert a room in that new GitLab group

   db.troupes.insert({
           "groupId" : db.groups.findOne({ "lcUri" : "gitlab-org-gitter-webapp", })._id,
           "lcUri" : "gitlab-org-gitter-webapp/community",
           "uri" : "gitlab-org-gitter-webappy/community",
           "sd" : {
                   "internalId" : db.groups.findOne({ "lcUri" : "gitlab-org-gitter-webapp", })._id,
                   "extraAdmins" : [ ],
                   "extraMembers" : [ ],
                   "members" : "PUBLIC",
                   "public" : true,
                   "admins" : "GROUP_ADMIN",
                   "type" : "GROUP"
           }
   });

3. Visit gitlab-org-gitter-webapp/community signed in with your GitLab account (ensure the user you sign in with is a maintainer of https://gitlab.com/gitlab-org/gitter/webapp)
4. Room settings dropdown -> Permissions -> Edit community permissions (in the bottom-left corner of the modal)
5. Notice it says Anyone with maintainer access to the gitlab-org/gitter/webapp project on GitLab