[gardening] Skip slow dart/isolates/fast_object_copy_test on vm-kernel-precomp-*sim* bots
[gardening] Skip slow dart/isolates/fast_object_copy_test on vm-kernel-precomp-*sim* bots

Fixes https://github.com/dart-lang/sdk/issues/49060

Change-Id: I8c312ac1f92b2ee854acf59a02d46131e55316ad
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/245401
Reviewed-by: Martin Kustermann <a35dd5b79fac84b2bb3b026a16b8becc55af5961@google.com>
Commit-Queue: Alexander Markov <239e774fd29abc1267878f57afe1a8a03e0ca887@google.com>
Auto-Submit: Alexander Markov <239e774fd29abc1267878f57afe1a8a03e0ca887@google.com>
Commit-Queue: Martin Kustermann <a35dd5b79fac84b2bb3b026a16b8becc55af5961@google.com>

dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk