Moved high bitrate texture tests to engine (flutter#179906)

This adds a few goldens where skia supports the file format. This is a
bit more scalable and direct than managing integration tests.

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Author: gaaclarke

.ci.yaml

@@ -5401,16 +5401,6 @@ targets:
         ["devicelab", "ios", "mac"]
       task_name: wide_gamut_ios
 
-  - name: Mac_ios high_bitrate_images
-    recipe: devicelab/devicelab_drone
-    presubmit: true
-    bringup: true
-    timeout: 60
-    properties:
-      tags: >
-        ["devicelab", "ios", "mac"]
-      task_name: high_bitrate_images_ios
-
   - name: Mac_x64_ios hot_mode_dev_cycle_ios__benchmark
     recipe: devicelab/devicelab_drone
     presubmit: false

TESTOWNERS

@@ -79,7 +79,6 @@
 /dev/devicelab/bin/tasks/gradient_dynamic_perf__e2e_summary.dart @flar @flutter/engine
 /dev/devicelab/bin/tasks/gradient_static_perf__e2e_summary.dart @flar @flutter/engine
 /dev/devicelab/bin/tasks/gradle_java8_compile_test.dart @jesswrd @flutter/android
-/dev/devicelab/bin/tasks/high_bitrate_images_ios.dart @gaaclarke @flutter/engine
 /dev/devicelab/bin/tasks/hot_mode_dev_cycle_linux__benchmark.dart @bkonyi @flutter/tool
 /dev/devicelab/bin/tasks/hybrid_android_views_integration_test.dart @gmackall @flutter/android
 /dev/devicelab/bin/tasks/image_list_jit_reported_duration.dart @jtmcdole @flutter/engine

dev/devicelab/bin/tasks/high_bitrate_images_ios.dart

@@ -247,14 +247,6 @@ TaskFunction createWideGamutTest() {
   ).call;
 }
 
-TaskFunction createHighBitrateImagesTest() {
-  return IntegrationTest(
-    '${flutterDirectory.path}/dev/integration_tests/high_bitrate_images',
-    'integration_test/app_test.dart',
-    createPlatforms: <String>['ios'],
-  ).call;
-}
-
 class DriverTest {
   DriverTest(
     this.testDirectory,