Remove the tests for rotate and crop from the Android scenario_app. (flutter#51769)

Closes flutter#145957.

As @jonahwilliams and @johnmccutchan and I discussed (flutter#144407), the functionality that was being tested was actually _Android's_ ability to rotate and crop `SurfaceTexture`-backed textures. This same functionality doesn't even exist in the `ImageReader`-based textures (read: modern Android devices):

> Due to an oversight by Android, ImageReader backed surfaces do not respect metadata applied to the surface (rotation & crop). Rotation information is not available at all and crop information is corrupted by the ImageReader (only the width/height is propagated the origin offset is not).

We might decide to re-add this functionality in the Dart `Texture` widget, but given we'll be migrating our plugins to `SurfaceProducer` (again, read: using `ImageTexture` for most Android phones), it's pointless to test this (and isn't even testing Flutter's code).

This reduces our test suite significantly (8 tests down to 2), which should also help with runtime and flakiness.

/cc @zanderso who I'm sure will be stoked.

Author: matanlurey

testing/scenario_app/android/README.md

@@ -355,6 +355,32 @@ device (you might find it easier trying the `stdout` of the test first, which
 uses rudimentary log filtering). In the case of multiple runs, the logs are
 prefixed with the test configuration and run attempt.
 
+### Gradle is failing due to an "not part of the dependency lock state" error
+
+If you update dependencies in the `app/build.gradle` file, you may encounter an
+error (probably in CI) that looks like:
+
+```txt
+FAILED: scenario_app/reports/lint-results.xml
+vpython3 ../../flutter/testing/rules/run_gradle.py /b/s/w/ir/cache/builder/src/flutter/testing/scenario_app/android lint --no-daemon -Pflutter_jar=/b/s/w/ir/cache/builder/src/out/android_emulator_skia_debug_x64/flutter.jar -Pout_dir=/b/s/w/ir/cache/builder/src/out/android_emulator_skia_debug_x64/scenario_app --project-cache-dir=/b/s/w/ir/cache/builder/src/out/android_emulator_skia_debug_x64/scenario_app/.gradle --gradle-user-home=/b/s/w/ir/cache/builder/src/out/android_emulator_skia_debug_x64/scenario_app/.gradle
+
+FAILURE: Build failed with an exception.
+
+* What went wrong:
+Execution failed for task ':app:checkDebugAarMetadata'.
+> Could not resolve all files for configuration ':app:debugRuntimeClasspath'.
+   > Resolved 'org.hamcrest:hamcrest-core:1.3' which is not part of the dependency lock state
+   > Resolved 'com.google.code.findbugs:jsr305:2.0.2' which is not part of the dependency lock state
+```
+
+This is because [`gradle.lockfile`](./app/gradle.lockfile) is out of date. To
+update it, run:
+
+```sh
+cd testing/scenario_app/android
+$ENGINE_SRC/third_party/gradle/bin/gradle app:dependencies --write-locks
+```
+
 ## Getting Help
 
 To suggest changes, or highlight problems, please [file an issue](https://github.com/flutter/flutter/issues/new?labels=e:%20scenario-app,engine,platform-android,fyi-android,team-engine).

testing/scenario_app/android/app/build.gradle

@@ -59,6 +59,7 @@ dependencies {
     }
     implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
     implementation 'com.google.android.material:material:1.0.0'
+    implementation 'androidx.test.ext:junit:1.1.5'
     androidTestImplementation 'junit:junit:4.12'
     androidTestImplementation 'androidx.test:runner:1.2.0'
     androidTestImplementation 'androidx.test:rules:1.2.0'