build: Add maestro based integration tests

lib/pages/chat_list/client_chooser_button.dart

@@ -175,18 +175,23 @@ class ClientChooserButton extends StatelessWidget {
         clipBehavior: Clip.hardEdge,
         borderRadius: BorderRadius.circular(99),
         color: Colors.transparent,
-        child: PopupMenuButton<Object>(
-          popUpAnimationStyle: FluffyThemes.isColumnMode(context)
-              ? AnimationStyle.noAnimation
-              : null, // https://github.com/flutter/flutter/issues/167180
-          onSelected: (o) => _clientSelected(o, context),
-          itemBuilder: _bundleMenuItems,
-          child: Center(
-            child: Avatar(
-              mxContent: snapshot.data?.avatarUrl,
-              name:
-                  snapshot.data?.displayName ?? matrix.client.userID?.localpart,
-              size: 32,
+        child: Semantics(
+          identifier: 'accounts_and_settings',
+          child: PopupMenuButton<Object>(
+            tooltip: 'Accounts and settings',
+            popUpAnimationStyle: FluffyThemes.isColumnMode(context)
+                ? AnimationStyle.noAnimation
+                : null, // https://github.com/flutter/flutter/issues/167180
+            onSelected: (o) => _clientSelected(o, context),
+            itemBuilder: _bundleMenuItems,
+            child: Center(
+              child: Avatar(
+                mxContent: snapshot.data?.avatarUrl,
+                name:
+                    snapshot.data?.displayName ??
+                    matrix.client.userID?.localpart,
+                size: 32,
+              ),
             ),
           ),
         ),