Users: Enable case insensitive login by default (#66134)

* enable case insensitive by default

* fix missing case-insensitive query

* fix missing case insensitive query

* fix missing case insensitive query in temp_user

* skip integration testing in mysql

* skip integration testing in mysql

* use t.cleanup

* lowercase only once

* aligned to only using sql as that is what we do in other parts

---------

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

pkg/services/temp_user/tempuserimpl/temp_user.go

@@ -5,6 +5,7 @@ import (
 
 	"github.com/grafana/grafana/pkg/infra/db"
 	tempuser "github.com/grafana/grafana/pkg/services/temp_user"
+	"github.com/grafana/grafana/pkg/setting"
 )
 
 type Service struct {
@@ -13,9 +14,10 @@ type Service struct {
 
 func ProvideService(
 	db db.DB,
+	cfg *setting.Cfg,
 ) tempuser.Service {
 	return &Service{
-		store: &xormStore{db: db},
+		store: &xormStore{db: db, cfg: cfg},
 	}
 }