fix(test): wait for async process info update in terminal title test

The "clear stale title after child process exits" test had a race
condition on Windows where the flyout label still showed "node.exe"
because the async process detection hadn't completed yet. Add an
awaitsFor that polls until the flyout label no longer contains "node".

Author: abose

test/spec/Terminal-integ-test.js

@@ -528,8 +528,20 @@ define(function (require, exports, module) {
                         return title.indexOf("TestCustomTitle") === -1;
                     }, "stale title to be cleared after exit", 15000);
 
+                    // Wait for the process info to update (async)
+                    // so the flyout label reflects the shell, not the
+                    // exited child process.
+                    await awaitsFor(function () {
+                        triggerFlyoutRefresh();
+                        const lbl = testWindow.$(
+                            ".terminal-flyout-item.active "
+                            + ".terminal-flyout-title"
+                        ).text();
+                        return lbl && lbl.indexOf("node") === -1;
+                    }, "flyout label to show shell instead of node",
+                    15000);
+
                     // The flyout label should be back to the shell
-                    triggerFlyoutRefresh();
                     const label = testWindow.$(
                         ".terminal-flyout-item.active "
                         + ".terminal-flyout-title"