Enable unparam, prealloc, sqlclosecheck linters

Signed-off-by: m.nabokikh <maksim.nabokikh@flant.com>

connector/ldap/ldap.go

@@ -609,7 +609,7 @@ func (c *ldapConnector) groups(ctx context.Context, user ldap.Entry) ([]string,
 		}
 	}
 
-	var groupNames []string
+	groupNames := make([]string, 0, len(groups))
 	for _, group := range groups {
 		name := getAttr(*group, c.GroupSearch.NameAttr)
 		if name == "" {