tests: kernel: set timeslice size to 0 in tests that do not exercise it

Sets CONFIG_TIMESLICE_SIZE=0 for tests that previously expected to run
without timeslicing enabled, and now fail with the default
CONFIG_TIMESLICE_SIZE=20. Note that timeslicing functionality is still
included, but no actual timeslicing is performed.

Signed-off-by: Daniel Mangum <georgedanielmangum@gmail.com>

samples/subsys/zbus/msg_subscriber/prj.conf

@@ -3,6 +3,7 @@ CONFIG_LOG_MODE_MINIMAL=y
 CONFIG_ASSERT=y
 CONFIG_BOOT_BANNER=n
 CONFIG_MAIN_THREAD_PRIORITY=3
+CONFIG_TIMESLICE_SIZE=0
 CONFIG_ZBUS=y
 CONFIG_ZBUS_LOG_LEVEL_INF=y
 CONFIG_ZBUS_CHANNEL_NAME=y

tests/integration/kernel/prj.conf

@@ -1,2 +1,3 @@
 CONFIG_ZTEST=y
 CONFIG_MP_MAX_NUM_CPUS=1
+CONFIG_TIMESLICE_SIZE=0

tests/kernel/pipe/deprecated/pipe/prj.conf

@@ -1,4 +1,5 @@
 CONFIG_ZTEST=y
 CONFIG_TEST_USERSPACE=y
 CONFIG_MP_MAX_NUM_CPUS=1
+CONFIG_TIMESLICE_SIZE=0
 CONFIG_PIPES=y

tests/kernel/semaphore/semaphore/prj.conf

@@ -3,3 +3,4 @@ CONFIG_IRQ_OFFLOAD=y
 CONFIG_TEST_USERSPACE=y
 CONFIG_ZTEST_FATAL_HOOK=y
 CONFIG_MAX_THREAD_BYTES=3
+CONFIG_TIMESLICE_SIZE=0