RTEMS | testsuites: Tests which assume a fast target (#5710)

[Sebastian Huber (@sebhub)]

Issue created by Sebastian Huber: https://gitlab.rtems.org/rtems/rtos/rtems/-/work_items/5710



Six tests assume that the target executes fast enough for an operation to fit
inside a window they do not state. On a slow target or an emulator they fail
without a defect in the code they test.

`psxclock` allows no tick of tolerance. `sp69` uses an asymmetric wall time
window. `sptimecounter02` bounds the error by a constant rather than by a tick.
The rbtree unit test records every verification, which makes the report far
larger than it needs to be. `CallWithinISR()` waits without a bound. `sp20` does
not flush its report, so the last part stays in the stream buffer when the
system shuts down.

Found while running the full test suite on eleven simulators. This description
was created with Claude Code assistance.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/work_items/5710
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