fix(testing): force dev server to exit when exiting.

packages/cypress/src/executors/cypress/cypress.impl.ts

@@ -67,19 +67,26 @@ export default async function cypressExecutor(
   options = normalizeOptions(options, context);
   // this is used by cypress component testing presets to build the executor contexts with the correct configuration options.
   process.env.NX_CYPRESS_TARGET_CONFIGURATION = context.configurationName;
-  let success;
+  let success: boolean;
+  const devServerIter = startDevServer(options, context);
 
-  for await (const devServerValues of startDevServer(options, context)) {
+  for await (const devServerValues of devServerIter) {
     try {
       success = await runCypress(devServerValues.baseUrl, {
         ...options,
         portLockFilePath: devServerValues.portLockFilePath,
       });
-      if (!options.watch) break;
+      if (!options.watch) {
+        devServerIter.return();
+        break;
+      }
     } catch (e) {
       logger.error(e.message);
       success = false;
-      if (!options.watch) break;
+      if (!options.watch) {
+        devServerIter.return();
+        break;
+      }
     }
   }