This task is to make the following enhancements to the SST test suites:
- Reduce the running time of the SST reliability tests to a level acceptable for running after each change.
- Add progress markers to the SST reliability tests.
- Refactor duplicated thread management code in the non-secure SST tests into an interface.
- Split overloaded SST tests into multiple smaller tests, and add some missing ones.
- Move the SST policy test suite to the non-secure side and then re-enable it.