testsuite: ztest: Increase ZTEST_TEST_DELAY_MS to 5000

This commit increases the default value of `ZTEST_TEST_DELAY_MS` from 3000
to 5000 milliseconds because the current value of 3000ms may not be
sufficient for the hosts with lower CPU clock frequency (e.g. new Zephyr CI
runners with cost-effective processors).

Signed-off-by: Stephanos Ioannidis <[email protected]>

Author: stephanosio

subsys/testsuite/ztest/Kconfig

@@ -34,7 +34,7 @@ config ZTEST_SHELL
 
 config ZTEST_CPU_HOLD_TIME_MS
 	int "Time in milliseconds to hold other CPUs for 1cpu type tests"
-	default 3000
+	default 5000
 	help
 	  This option is used to specify the maximum time in milliseconds for
 	  which a 1cpu type test may execute on a multicpu system. The default