LDAP: Use an interface instead of a bus to get group teams (#42165)

* Remove bus for GetTeams for LDAP

* Fix lint

pkg/services/ldap/ldap_groups.go

@@ -0,0 +1,17 @@
+package ldap
+
+import "github.com/grafana/grafana/pkg/models"
+
+type Groups interface {
+	GetTeams(groups []string) ([]models.TeamOrgGroupDTO, error)
+}
+
+type OSSGroups struct{}
+
+func ProvideGroupsService() *OSSGroups {
+	return &OSSGroups{}
+}
+
+func (*OSSGroups) GetTeams(_ []string) ([]models.TeamOrgGroupDTO, error) {
+	return nil, nil
+}