test: add test that shows abort signals are not respected

[SgtPooki]

Title

test: add test that shows abort signals are not respected

Description

This PR is in progress, because the test is not yet passing.

Notes & open questions

Will likely need a hand from @achingbrain on this one since I've added a ton of throwIfAborted and abort handlers to abstract-session and cannot get it to abort.

Change checklist

• [ ] I have performed a self-review of my own code
• [ ] I have made corresponding changes to the documentation if necessary (this includes comments as well)
• [ ] I have added tests that prove my fix is effective or that my feature works