[vm/concurrency] Mark some tests as slow, make api test work in dwarf stack traces mode
This should make flaky timeouts of some tests go away as well as make
the vm/dart{,_2}/isolates/dart_api_create_lightweight_isolate_test test
pass in dwarf stack traces mode.
TEST=Gets flaky/failing tests to pass.
Change-Id: Iaa1fe484b01479f80f65539d04aba3b3798cad1d
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/207022
Reviewed-by: Tess Strickland <sstrickl@google.com>
Commit-Queue: Martin Kustermann <kustermann@google.com>
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