Add test for Self Setting Timers close to GC TImer

Create test for bug around self setting timers and interaction with GC Timers. Create timer that is a milli behind GC so they likely show up in the same bundle.

Scenario this is expected to catch:

If a user timer and the GC timer show up in the same bundle, and the user timer resets itself, and the reset timer is not called (because it had to be committed and then restored), then you have your failure.

Imported from Jira [BEAM-8090](https://issues.apache.org/jira/browse/BEAM-8090). Original Jira may contain additional context.
Reported by: rarokni@gmail.com.