UserService: use the UserService instead of calling sqlstore directly (#55745)

* UserService: update callers to use the UserService instead of calling sqlstore directly

There is one major change hiding in this PR. UserService.Delete originally called a number of services to delete user-related records. I moved everything except the actual call to the user table, and moved those into the API. This was done to avoid dependencies cycles; many of our services depend on the user service, so the user service itself should have as few dependencies as possible.

pkg/services/sqlstore/stats_test.go

@@ -5,11 +5,12 @@ import (
 	"fmt"
 	"testing"
 
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+
 	"github.com/grafana/grafana/pkg/models"
 	"github.com/grafana/grafana/pkg/services/org"
 	"github.com/grafana/grafana/pkg/services/user"
-	"github.com/stretchr/testify/assert"
-	"github.com/stretchr/testify/require"
 )
 
 func TestIntegrationStatsDataAccess(t *testing.T) {
@@ -118,13 +119,6 @@ func populateDB(t *testing.T, sqlStore *SQLStore) {
 	err = sqlStore.AddOrgUser(context.Background(), cmd)
 	require.NoError(t, err)
 
-	// update 1st user last seen at
-	updateUserLastSeenAtCmd := &models.UpdateUserLastSeenAtCommand{
-		UserId: users[0].ID,
-	}
-	err = sqlStore.UpdateUserLastSeenAt(context.Background(), updateUserLastSeenAtCmd)
-	require.NoError(t, err)
-
 	// force renewal of user stats
 	err = sqlStore.updateUserRoleCountsIfNecessary(context.Background(), true)
 	require.NoError(t, err)