tests/kernel/sched/schedule_api: Filter for MULTIQ platforms
tests/kernel/sched/schedule_api: Filter for MULTIQ platforms

This test requires more than 32 static priorities by default, and
doesn't run with the multiq scheduler without a special configuration.
That used to be specified per-platform, but got moved to a separate
test case a while back.

This broke non-default platforms like qemu_cortex_m3 which use
SCHED_MULTIQ as their default backend.  Put a filter in place instead
of going back to per-platform changes.

Fixes #19437

Signed-off-by: Andy Ross <c70f9a6bf6ee0cd69c8af4ce5e6b131945769315@intel.com>

zephyrproject-rtos/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,galak/zephyr,galak/zephyr,nashif/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,Vudentz/zephyr,Vudentz/zephyr,galak/zephyr,finikorg/zephyr,nashif/zephyr,Vudentz/zephyr,galak/zephyr,finikorg/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,nashif/zephyr,zephyrproject-rtos/zephyr,Vudentz/zephyr,Vudentz/zephyr,nashif/zephyr,Vudentz/zephyr,nashif/zephyr