[v11.0.x] User: add second migration for lowercasing login/email of users (#88917)

User: add second migration for lowercasing login/email of users (#88915)

(cherry picked from commit 39bd13f877)

Co-authored-by: Eric Leijonmarck <eric.leijonmarck@gmail.com>

pkg/services/user/userimpl/store_test.go

@@ -924,8 +924,8 @@ func TestIntegrationUserUpdate(t *testing.T) {
 		require.Equal(t, "Change Name", result.Name)
 
 		// Unchanged
-		require.Equal(t, "loginUSER3", result.Login)
-		require.Equal(t, "USER3@test.com", result.Email)
+		require.Equal(t, "loginuser3", result.Login)
+		require.Equal(t, "user3@test.com", result.Email)
 	})
 }