Remove @next/font resolving for font loaders (#65601)

Remove font loaders resolving for `@next/font`, users should directly
rely on `next/font`, they're intended to be removed.

Also removed the legacy tests

packages/next/src/build/swc/options.ts

@@ -382,14 +382,7 @@ export function getLoaderSWCOptions({
     esm: !!esm,
   })
   baseOptions.fontLoaders = {
-    fontLoaders: [
-      'next/font/local',
-      'next/font/google',
-
-      // TODO: remove this in the next major version
-      '@next/font/local',
-      '@next/font/google',
-    ],
+    fontLoaders: ['next/font/local', 'next/font/google'],
     relativeFilePathFromRoot,
   }
   baseOptions.cjsRequireOptimizer = {

packages/next/src/build/webpack/config/blocks/css/index.ts

@@ -211,9 +211,6 @@ export const css = curry(async function css(
   const nextFontLoaders: Array<[string | RegExp, string, any?]> = [
     [require.resolve('next/font/google/target.css'), googleLoader],
     [require.resolve('next/font/local/target.css'), localLoader],
-    // TODO: remove this in the next major version
-    [/node_modules[\\/]@next[\\/]font[\\/]google[\\/]target.css/, googleLoader],
-    [/node_modules[\\/]@next[\\/]font[\\/]local[\\/]target.css/, localLoader],
   ]
 
   nextFontLoaders.forEach(([fontLoaderTarget, fontLoaderPath]) => {