[Catalyst] SIMs screen migration

- Add a flag for the migration
- Add the skeleton of the screen

Test: atest MobileNetworkListScreenTest
Bug: 368355368
Flag: com.android.settings.flags.catalyst_mobile_network_list
Change-Id: I9d5d57b78d8f2c7d2bc6fd02e402fcdaf5b97bdf

tests/robotests/src/com/android/settings/network/MobileNetworkListScreenTest.kt

@@ -0,0 +1,36 @@
+/*
+ * Copyright (C) 2024 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.android.settings.network
+
+import androidx.test.ext.junit.runners.AndroidJUnit4
+import com.android.settings.flags.Flags
+import com.android.settingslib.preference.CatalystScreenTestCase
+import com.google.common.truth.Truth.assertThat
+import org.junit.Test
+import org.junit.runner.RunWith
+
+@RunWith(AndroidJUnit4::class)
+class MobileNetworkListScreenTest : CatalystScreenTestCase() {
+    override val preferenceScreenCreator = MobileNetworkListScreen()
+
+    override val flagName: String
+        get() = Flags.FLAG_CATALYST_MOBILE_NETWORK_LIST
+
+    @Test
+    fun key() {
+        assertThat(preferenceScreenCreator.key).isEqualTo(MobileNetworkListScreen.KEY)
+    }
+}