Reverts "Platform view devicelab ad banner scroll list real ads (#144745)" (#145189)

Reverts: flutter/flutter#144745
Initiated by: gspencergoog
Reason for reverting: appears to have broken the build.

Original PR Author: hellohuanlin

Reviewed By: {jmagman, jonahwilliams}

This change reverts the following previous change:
This benchmark is to measure the platform view performance improvement. 

It is similar to https://github.com/lucalooz/flutter_ads_list_perf

There's still a pending issue https://github.com/flutter/flutter/issues/144339

*List which issues are fixed by this PR. You must list at least one issue. An issue is not required if the PR fixes something trivial like a typo.*

Fixes https://github.com/flutter/flutter/issues/143534
Fixes https://github.com/flutter/flutter/issues/143257

*If you had to change anything in the [flutter/tests] repo, include a link to the migration guide as per the [breaking change policy].*

TESTOWNERS

@@ -207,7 +207,6 @@
 /dev/devicelab/bin/tasks/platform_channels_benchmarks_ios.dart @gaaclarke @flutter/engine
 /dev/devicelab/bin/tasks/platform_interaction_test_ios.dart @hellohuanlin @flutter/engine
 /dev/devicelab/bin/tasks/platform_view_ios__start_up.dart @stuartmorgan @flutter/plugin
-/dev/devicelab/bin/tasks/platform_views_scroll_perf_ad_banners__timeline_summary.dart @hellohuanlin @flutter/engine
 /dev/devicelab/bin/tasks/platform_views_scroll_perf_ios__timeline_summary.dart @hellohuanlin @flutter/engine
 /dev/devicelab/bin/tasks/platform_views_scroll_perf_non_intersecting_impeller_ios__timeline_summary.dart @jonahwilliams @flutter/engine
 /dev/devicelab/bin/tasks/post_backdrop_filter_perf_ios__timeline_summary.dart @hellohuanlin @flutter/engine