internal/db: add iam_scope indexes

These will help the iam_scope list queries

internal/db/schema/migrations/oss/postgres/80/08_iam_updates.up.sql

@@ -22,4 +22,10 @@ begin;
       on iam_group (update_time desc, public_id desc);
   analyze iam_group;
 
+  create index iam_scope_create_time_public_id_idx
+      on iam_scope (create_time desc, public_id desc);
+  create index iam_scope_update_time_public_id_idx
+      on iam_scope (update_time desc, public_id desc);
+  analyze iam_scope;
+
 commit;

internal/db/sqltest/tests/pagination/iam_scope.sql

@@ -0,0 +1,12 @@
+-- Copyright (c) HashiCorp, Inc.
+-- SPDX-License-Identifier: BUSL-1.1
+
+begin;
+  select plan(2);
+
+  select has_index('iam_scope', 'iam_scope_create_time_public_id_idx', array['create_time', 'public_id']);
+  select has_index('iam_scope', 'iam_scope_update_time_public_id_idx', array['update_time', 'public_id']);
+
+  select * from finish();
+
+rollback;