perf(flutter): skip disabled semantic map work

Author: Chinmay-KB

sdks/flutter/packages/tugboat/lib/src/controller.dart

@@ -5647,7 +5647,7 @@ class TugboatReplayController extends ChangeNotifier {
         );
       }
     }
-    if (emitViewportSemanticMap) {
+    if (emitViewportSemanticMap && config.semanticMapEmissionEnabled) {
       _viewportSemantics.maybeEmit(
         inventory,
         resolver: _anchorResolver,

sdks/flutter/packages/tugboat/test/viewport_semantic_map_test.dart

@@ -499,6 +499,7 @@ void main() {
         builder: (context, child) => TugboatReplay.wrapApp(
           config: const TugboatReplayConfig(
             enabled: true,
+            emitViewportSemanticMap: true,
             settleDelay: Duration.zero,
             interactionClaimWindow: Duration.zero,
             enableGlobalPointerCapture: false,