Auth: remove org count from signedInUser (#72661)

* tweaks

* remove org count from signedinUser

* remove org count from signedinUser store

* fix broken tests

* restore frontend interface

pkg/services/authn/clients/api_key_test.go

@@ -76,14 +76,12 @@ func TestAPIKey_Authenticate(t *testing.T) {
 				UserID:           1,
 				OrgID:            1,
 				IsServiceAccount: true,
-				OrgCount:         1,
 				OrgRole:          org.RoleViewer,
 				Name:             "test",
 			},
 			expectedIdentity: &authn.Identity{
 				ID:             "service-account:1",
 				OrgID:          1,
-				OrgCount:       1,
 				Name:           "test",
 				OrgRoles:       map[int64]org.RoleType{1: org.RoleViewer},
 				IsGrafanaAdmin: boolPtr(false),

pkg/services/authn/clients/ext_jwt_test.go

@@ -151,7 +151,6 @@ func TestExtendedJWT_Authenticate(t *testing.T) {
 			},
 			want: &authn.Identity{
 				OrgID:           1,
-				OrgCount:        0,
 				OrgName:         "",
 				OrgRoles:        map[int64]roletype.RoleType{1: roletype.RoleAdmin},
 				ID:              "user:2",

pkg/services/authn/clients/jwt_test.go

@@ -36,7 +36,6 @@ func TestAuthenticateJWT(t *testing.T) {
 	jwtHeaderName := "X-Forwarded-User"
 	wantID := &authn.Identity{
 		OrgID:           0,
-		OrgCount:        0,
 		OrgName:         "",
 		OrgRoles:        map[int64]roletype.RoleType{1: roletype.RoleAdmin},
 		ID:              "",