chore: retry all soft-fail Android E2E steps, add logging to iOS E2E (#4084)

* Allow test app to install external if it wants
It is quite large and managing emulator internal space is important

* Bump gradle in test app to 6.6, kotlin to current, compile/target SDKs to 29
Includes output of `./gradlew wrapper` to regenerate everything

* E2E action no longer needs special cache handling
Upstream bug resolved

* Increase emulator RAM and disable JNI checking in E2E test
This should speed things up a bit, increasing success rate vs timeouts

* Add iOS Detox tracing to E2E config
Should help diagnose iOS flakiness there

* Remove JDK8 config in Android E2E config
It is the default on macOS 10.15 runner, so special setup unnecessary

* Use Xcode 11.6 (current) for iOS E2E run
This is the default, so special configuration not needed, but
still need to extract the Xcode version for Detox build cache

* Decompose Android E2E tasks, retry all flaky steps

tests/android/gradle/wrapper/gradle-wrapper.properties

@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-6.5.1-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.6-all.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists