fix(ci): target sidebar reconnect roster response (#124430)

* test(ui): target selected reconnect roster request

* test(ui): decouple reconnect request scheduling

* test(ui): keep reconnect proof outcome-focused

ui/src/e2e/session-management.sidebar.e2e.test.ts

@@ -564,7 +564,7 @@ suite.define(() => {
         .poll(() => gateway.getSocketCount(), { timeout: 15_000 })
         .toBe(socketsBefore + 1);
       await gateway.deferNext("sessions.subscribe");
-      await gateway.deferNext("sessions.list");
+      await gateway.deferNext("sessions.list", { includeLastMessage: true });
       await gateway.setOnline(true);
       await waitForControlUiGatewayReady(page);
       await expect
@@ -583,8 +583,12 @@ suite.define(() => {
 
       await gateway.resolveDeferred("sessions.subscribe", { subscribed: true });
       await expect
-        .poll(async () => (await gateway.getRequests("sessions.list")).length, { timeout: 15_000 })
-        .toBeGreaterThan(initialListCount);
+        .poll(async () =>
+          (await gateway.getRequests("sessions.list"))
+            .slice(initialListCount)
+            .some((request) => requireRecord(request.params).includeLastMessage === true),
+        )
+        .toBe(true);
       await gateway.resolveDeferred(
         "sessions.list",
         sessionsListResponse([