Fix Delete Invalid Room Test case (Azure#37887)

* Increase Rooms .Net SDK code coverage

* List Room get first two pages

* Fix delete invalid room test

* Remove unneeded recordings

---------

Co-authored-by: Minnie Liu <peiliu@microsoft.com>

Author: minnieliu

sdk/communication/Azure.Communication.Rooms/tests/RoomsClient/RoomsClientLiveTests.cs

@@ -659,16 +659,16 @@ public async Task DeleteRoom_Success()
         }
 
         [Test]
-        public void DeleteRoomDoesNotExist_Fail()
+        public void DeleteInvalidRoomId_Fail()
         {
             // Arrange
             var roomsClient = CreateInstrumentedRoomsClient(RoomsClientOptions.ServiceVersion.V2023_06_14);
-            var ivnalidRoomId = "99437728598278806";
+            var ivnalidRoomId = "123";
 
             // Act and Assert:
             RequestFailedException? ex = Assert.ThrowsAsync<RequestFailedException>(async () => await roomsClient.DeleteRoomAsync(ivnalidRoomId));
             Assert.NotNull(ex);
-            Assert.AreEqual(404, ex?.Status);
+            Assert.AreEqual(400, ex?.Status);
         }
 
         private void ValidateRoom(CommunicationRoom? room)