refactor(admin): remove legacy menu editor

src/features/housekeeping/migration/discover-legacy-pages.test.ts

@@ -29,7 +29,7 @@ describe("discoverLegacyPages", () => {
 	it("discovers the exact legacy administration inventory", () => {
 		const pages = discoverLegacyPages();
 
-		expect(pages).toHaveLength(139);
+		expect(pages).toHaveLength(138);
 		expect(pages).toContainEqual({
 			surface: "admin",
 			legacyPath: "/admin/users/:id/edit",