fix(@angular/build): exclude .angular from coverage instrumentation

The instrumentation filter now excludes files in the .angular directory in addition to node_modules.

Author: cexbrayat

packages/angular/build/src/builders/karma/coverage.ts

@@ -13,7 +13,7 @@ export function createInstrumentationFilter(includedBasePath: string, excludedPa
   return (request: string): boolean => {
     return (
       !excludedPaths.has(request) &&
-      !/\.(e2e|spec)\.tsx?$|[\\/]node_modules[\\/]/.test(request) &&
+      !/\.(e2e|spec)\.tsx?$|[\\/]node_modules[\\/]|[\\/]\.angular[\\/]/.test(request) &&
       request.startsWith(includedBasePath)
     );
   };