Teams: Move team API to own service (#76347)

* move team API to its own service

* remove uneeded import

* reshare pref api logic

pkg/api/common_test.go

@@ -214,7 +214,6 @@ func setupScenarioContext(t *testing.T, url string) *scenarioContext {
 	return sc
 }
 
-// FIXME: This user should not be anonymous
 func authedUserWithPermissions(userID, orgID int64, permissions []accesscontrol.Permission) *user.SignedInUser {
 	return &user.SignedInUser{UserID: userID, OrgID: orgID, OrgRole: org.RoleViewer, Permissions: map[int64]map[string][]string{orgID: accesscontrol.GroupScopesByAction(permissions)}}
 }