fix(@angular/build): Ensure disposal of close-javascript-transformer

The onDispose callback doesn't close the javascriptTransformer correctly
yet. This ensures that all worker pools are cleaned after a disposal.

Author: Aukevanoost

packages/angular/build/src/tools/esbuild/angular/compiler-plugin.ts

@@ -591,6 +591,7 @@ export function createCompilerPlugin(
       build.onDispose(() => {
         sharedTSCompilationState?.dispose();
         void compilation.close?.();
+        void javascriptTransformer.close();
         void cacheStore?.close();
       });