DEV: Drop post_uploads table (#23673)

The post_uploads table has not been used since 9db8f00b3d

db/post_migrate/20230926165821_drop_post_uploads_table.rb

@@ -0,0 +1,13 @@
+# frozen_string_literal: true
+
+class DropPostUploadsTable < ActiveRecord::Migration[7.0]
+  DROPPED_TABLES ||= %i[post_uploads]
+
+  def up
+    DROPPED_TABLES.each { |table| Migration::TableDropper.execute_drop(table) }
+  end
+
+  def down
+    raise ActiveRecord::IrreversibleMigration
+  end
+end