test(e2e, android): forward-port test app to targetSdkVersion 31

Required a patch to Detox, tracked here:
wix/Detox#3055

tests/android/app/src/debug/AndroidManifest.xml

@@ -8,6 +8,9 @@
  android:usesCleartextTraffic="true"
  tools:targetApi="28"
  tools:ignore="GoogleAppIndexingWarning">
- <activity android:name="com.facebook.react.devsupport.DevSettingsActivity" />
+ <activity
+ android:name="com.facebook.react.devsupport.DevSettingsActivity"
+ android:exported="true"
+ />
  </application>
 </manifest>

tests/android/app/src/main/AndroidManifest.xml

@@ -21,6 +21,7 @@
  android:name=".MainActivity"
  android:label="@string/app_name"
  android:configChanges="keyboard|keyboardHidden|orientation|screenSize|uiMode"
+ android:exported="true"
  android:launchMode="singleTask"
  android:windowSoftInputMode="adjustResize">
  <intent-filter>

tests/android/build.gradle

@@ -1,8 +1,8 @@
 buildscript {
  ext.buildToolsVersion = '31.0.0'
  ext.minSdkVersion = 21
- ext.compileSdkVersion = 30
- ext.targetSdkVersion = 30
+ ext.compileSdkVersion = 31
+ ext.targetSdkVersion = 31
  ext.ndkVersion = '21.4.7075529'
 
  ext.kotlinVersion = '1.5.31' // https://kotlinlang.org/releases.html

tests/patches/detox+18.23.1.patch

@@ -1,3 +1,24 @@
+diff --git a/node_modules/detox/android/detox/build.gradle b/node_modules/detox/android/detox/build.gradle
+index 8bef864..3689459 100644
+--- a/node_modules/detox/android/detox/build.gradle
++++ b/node_modules/detox/android/detox/build.gradle
+@@ -86,12 +86,12 @@ dependencies {
+ // Versions are in-sync with the 'androidx-test-1.2.0' release/tag of the android-test github repo,
+ // used by the Detox generator. See https://github.com/android/android-test/releases/tag/androidx-test-1.2.0
+ // Important: Should remain so when generator tag is replaced!
+- api('androidx.test.espresso:espresso-core:3.3.0') { // Needed all across Detox but also makes Espresso seamlessly provided to Detox users with hybrid apps/E2E-tests.
++ api('androidx.test.espresso:espresso-core:3.4.0') { // Needed all across Detox but also makes Espresso seamlessly provided to Detox users with hybrid apps/E2E-tests.
+ exclude group: 'com.google.code.findbugs', module: 'jsr305'
+ }
+- api 'androidx.test.espresso:espresso-web:3.3.0' // Web-View testing
+- api 'androidx.test:rules:1.2.0' // Needed because of ActivityTestRule. Needed by users *and* internally used by Detox.
+- api 'androidx.test.ext:junit:1.1.1' // Needed so as to seamlessly provide AndroidJUnit4 to Detox users. Depends on junit core.
++ api 'androidx.test.espresso:espresso-web:3.4.0' // Web-View testing
++ api 'androidx.test:rules:1.4.0' // Needed because of ActivityTestRule. Needed by users *and* internally used by Detox.
++ api 'androidx.test.ext:junit:1.1.3' // Needed so as to seamlessly provide AndroidJUnit4 to Detox users. Depends on junit core.
+
+ // Version is the latest; Cannot sync with the Github repo (e.g. android/android-test) because the androidx
+ // packaging version of associated classes is simply not there...
 diff --git a/node_modules/detox/android/detox/src/full/java/com/wix/detox/reactnative/idlingresources/UIModuleIdlingResource.java b/node_modules/detox/android/detox/src/full/java/com/wix/detox/reactnative/idlingresources/UIModuleIdlingResource.java
 index 2407926..65d17d8 100644
 --- a/node_modules/detox/android/detox/src/full/java/com/wix/detox/reactnative/idlingresources/UIModuleIdlingResource.java