perf(@angular/build): dispose builder result context early in non-watch mode

Evaluates and extracts final output results into a list before calling result.dispose() in non-watch mode. This ensures all compiler worker processes (retaining the TypeScript program structures and cache) are terminated and reclaimed before yielding results to the caller for disk writing.

(cherry picked from commit 3019c80)

Author: clydin

packages/angular/build/src/builders/application/build-action.ts

@@ -148,7 +148,13 @@ export async function* runEsBuildBuildAction(
     // Output the first build results after setting up the watcher to ensure that any code executed
     // higher in the iterator call stack will trigger the watcher. This is particularly relevant for
     // unit tests which execute the builder and modify the file system programmatically.
-    yield* emitOutputResults(result, outputOptions);
+    const outputResults = [...emitOutputResults(result, outputOptions)];
+    if (!watch) {
+      await result.dispose();
+      // Set to true to prevent double-disposal of the result context in the finally block on generator exit
+      watchLoopStarted = true;
+    }
+    yield* outputResults;
 
     // Finish if watch mode is not enabled
     if (!watcher) {