fix(@angular/build): flatten builderName in cache directory path

Strip '@' and replace '/' in addition to ':' when normalizing builderName in normalizeCacheOptions so scoped builder names produce a single flat cache directory instead of nested subdirectories.

Author: alan-agius4

packages/angular/build/src/utils/normalize-cache.ts

@@ -140,7 +140,7 @@ export function normalizeCacheOptions(
 
   const cacheBasePath = getCacheBasePath(workspaceRoot, path);
   const localCacheBasePath = isAbsolute(path) ? path : resolve(workspaceRoot, path);
-  const normalizedBuilderName = builderName.replaceAll(':', '-');
+  const normalizedBuilderName = builderName.replaceAll('@', '').replaceAll(/[:/]/g, '-');
 
   return {
     enabled: cacheEnabled,

packages/angular/build/src/utils/normalize-cache_spec.ts

@@ -283,10 +283,10 @@ describe('normalizeCacheOptions', () => {
     const options = normalizeCacheOptions({}, workspaceRoot, 'my-app', '@angular/build:unit-test');
 
     expect(options.path).toBe(
-      resolve(workspaceRoot, '.angular/cache/0.0.0-PLACEHOLDER/my-app/@angular/build-unit-test'),
+      resolve(workspaceRoot, '.angular/cache/0.0.0-PLACEHOLDER/my-app/angular-build-unit-test'),
     );
     expect(options.localPath).toBe(
-      resolve(workspaceRoot, '.angular/cache/0.0.0-PLACEHOLDER/my-app/@angular/build-unit-test'),
+      resolve(workspaceRoot, '.angular/cache/0.0.0-PLACEHOLDER/my-app/angular-build-unit-test'),
     );
   });
 });