Add emergency call buttons to the work challenge screens in the case of

managed subscription for work telephony

Test: manually tested for now

Bug: b/258631630
Change-Id: I700d0408e3ffa86a595072b1a4aad62bac33b01d

res/drawable/work_challenge_emergency_button_background.xml

@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  ~ Copyright (C) 2022 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.
+  -->
+<inset xmlns:android="http://schemas.android.com/apk/res/android">
+    <shape android:shape="rectangle">
+        <corners android:radius="25dp"/>
+        <solid android:color="@android:color/system_accent3_100" />
+    </shape>
+</inset>