Revert "Upgrade to webpack@5 (#4725)" (#4872)

types/mocks.d.ts

@@ -25,13 +25,7 @@ declare module "*.scss" {
   const content: string;
   export = content;
 }
-
-// Declare everything what's bundled as webpack's type="asset/resource"
-// Should be mocked for tests support in jestConfig.moduleNameMapper (currently in "/package.json")
-declare module "*.svg";
-declare module "*.jpg";
-declare module "*.png";
-declare module "*.eot";
-declare module "*.woff";
-declare module "*.woff2";
-declare module "*.ttf";
+declare module "*.ttf" {
+  const content: string;
+  export = content;
+}