DEV: Promote historic post_deploy migrations (#25329)

This commit promotes all post_deploy migrations which existed in Discourse v3.1.0 (timestamp <= 20230405121454)

db/migrate/20230224225129_backfill_svg_sprites.rb

@@ -0,0 +1,9 @@
+# frozen_string_literal: true
+
+class BackfillSvgSprites < ActiveRecord::Migration[7.0]
+  disable_ddl_transaction!
+
+  def up
+    ThemeSvgSprite.refetch!
+  end
+end