Revert "[infra] Enable chromium.skip_successful_tests on cros at 50%"

This reverts commit ca12884f5bf91361a0665166287a044d4e74d9cc.

Reason for revert: A bad status was recorded
https://ci.chromium.org/ui/p/chromium/builders/try/lacros-amd64-generic-rel/971666/overview

Original change's description:
> [infra] Enable chromium.skip_successful_tests on cros at 50%
>
> This experiment prevents tests that have succeeded in the last 24
> hours from running in the same equivalent patchset
>
> Bug: 1419585
> Change-Id: Id55ff1ea7b97a3d3d598e624ad1b5293831413fc
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5053922
> Commit-Queue: Struan Shrimpton <sshrimp@google.com>
> Reviewed-by: Stephanie Kim <kimstephanie@google.com>
> Cr-Commit-Position: refs/heads/main@{#1229417}

Bug: 1419585
Change-Id: I277f0ec46f9ab45a5e957dc307b1cad1493b1241
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5068162
Reviewed-by: Stephanie Kim <kimstephanie@google.com>
Commit-Queue: Struan Shrimpton <sshrimp@google.com>
Cr-Commit-Position: refs/heads/main@{#1230037}