tests: ztest: provide test execution times per ztest testcase

Add execution time for testing result of each ztest testcase as:

START - test_sem_multi_take_timeout_diff_sem
PASS - test_sem_multi_take_timeout_diff_sem in 2.54 seconds

Fix #32137.

Signed-off-by: Enjia Mai <enjiax.mai@intel.com>