refactor: remove unused function

Remove unused code

Author: alan-agius4

packages/angular/build/src/builders/unit-test/options.ts

@@ -55,18 +55,3 @@ export async function normalizeOptions(
     providersFile: options.providersFile && path.join(workspaceRoot, options.providersFile),
   };
 }
-
-/**
- * Normalize a directory path string.
- * Currently only removes a trailing slash if present.
- * @param path A path string.
- * @returns A normalized path string.
- */
-function normalizeDirectoryPath(path: string): string {
-  const last = path[path.length - 1];
-  if (last === '/' || last === '\\') {
-    return path.slice(0, -1);
-  }
-
-  return path;
-}