SQLTemplate: Make Ident only work for identifiers (not any string) (#92387)

pkg/storage/unified/sql/testdata/mysql--resource_delete-simple.sql

@@ -1,7 +1,7 @@
-DELETE FROM "resource"
+DELETE FROM `resource`
     WHERE 1 = 1
-        AND "namespace" = 'nn'
-        AND "group"     = 'gg'
-        AND "resource"  = 'rr'
-        AND "name"      = 'name'
+        AND `namespace` = 'nn'
+        AND `group`     = 'gg'
+        AND `resource`  = 'rr'
+        AND `name`      = 'name'
 ;