Set namespace for testutils

Also upgrade androidx.arch.core:core-testing to 2.2.0-alpha01

Bug: 260660819
Test: Unit test
Test: Manually with Gallery
Change-Id: I5998f1539e2e0268b53604b5cad8c81bafefa956

packages/SettingsLib/Spa/testutils/build.gradle

@@ -20,6 +20,7 @@ plugins {
 }
 
 android {
+    namespace 'com.android.settingslib.spa.testutils'
     compileSdk TARGET_SDK
     buildToolsVersion = BUILD_TOOLS_VERSION
 
@@ -55,7 +56,7 @@ android {
 dependencies {
     api project(":spa")
 
-    api "androidx.arch.core:core-testing:2.1.0"
+    api "androidx.arch.core:core-testing:2.2.0-alpha01"
     api "androidx.compose.ui:ui-test-junit4:$jetpack_compose_version"
     api "com.google.truth:truth:1.1.3"
     api "org.mockito:mockito-core:2.21.0"