AOT/Sharedclasses PR Testing

[dsouzai]

Thanks to the test team's great work on getting AOT support on testing, it is now possible to enable AOT on ordinary tests by using TEST_FLAG=AOT (see #3774 (comment)). Additionally, the infra team has also been doing good work to have PR builds be, in essence, pipeline builds (see #2728) as well as to switch to using AdoptOpenJDK's JenkinsFiles for Test (see #1450).

I'm opening this issue so that once #2728 (and possibly #1450) is resolved, we should be able to enable PR tests for AOT. I believe we would need to do the following (@AdamBrousseau @smlambert feel free to correct/add):

• Mark tests that shouldn't be run twice, so that the TEST_FLAG=AOT is ignored Mark tests not suitable for AOT #5767
• Have the trigger infra recognize something like jenkins test <target>+aot <platform> <version> Make TEST_FLAG option generic #5685
• Have the build infra set TEST_FLAG=AOT when running tests. Make TEST_FLAG option generic #5685