profcollect: Switch to ScheduledExecutorService API to schedule periodic background tracing

The JobService API limits periodic job to be at least 15 minutes apart.
We need to schedule tracing more frequently than that.

Test: manual
Bug: 411080753
Flag: EXEMPT, bug fix
Change-Id: I1f3f6a2cf50b2145176b328b2b7efd882d65cb85