Add async index to partition table

Changelog: added

db/post_migrate/20241001170219_prepare_partitioned_async_index_merge_request_diff_commits_b5377a7a34.rb

+# frozen_string_literal: true
+
+class PreparePartitionedAsyncIndexMergeRequestDiffCommitsB5377a7a34 < Gitlab::Database::Migration[2.2]
+  include Gitlab::Database::PartitioningMigrationHelpers
+
+  milestone '17.5'
+  disable_ddl_transaction!
+
+  INDEX_NAME = 'index_merge_request_diff_commits_b5377a7a34_on_project_id'
+
+  def up
+    prepare_partitioned_async_index :merge_request_diff_commits_b5377a7a34, :project_id, name: INDEX_NAME
+  end
+
+  def down
+    unprepare_partitioned_async_index_by_name :merge_request_diff_commits_b5377a7a34, INDEX_NAME
+  end
+end

db/schema_migrations/20241001170219

+1f1f98b9673af082dba115856bf9b045033a5acd37b0ba19ea3dac043fa07df5
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