[gardening] Skip vm/dart{,_2}/isolates/fast_object_copy_test on sim* due to timeout
[gardening] Skip vm/dart{,_2}/isolates/fast_object_copy_test on sim* due to timeout

Closes https://github.com/dart-lang/sdk/issues/46740

TEST=ci

Change-Id: I076dcad6c1492c755c76ff6258ba0ad6935b1877
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/245364
Reviewed-by: Daco Harkes <930cbae0ca77f1954c53e32620d89cfcca318f00@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