Skip installd dexopt tests when ART Service is enabled.

Those code paths are not supposed to be used in that case, and there
may be consistency checks that fail.

Test: atest installd_dexopt_test
  with and without dalvik.vm.useartservice=true
Bug: 274100046
Change-Id: I552cae15db2809131b4b694e5116df62894d397d