fix(PrioritizedRRScheduler): solve intra-scheduler priority inversion

[atsushi421]

Description

This solves the intra-PrioritizedRRScheduler priority inversion same as PrioritizedFIFOScheduler.

I added the execution_ensured flag into get_next_task() to call it from invoke_preemption_tick(). Without execution_ensured flag, the set_current_task() would be called on primary CPU.

Related links

Design Document

How was this PR tested?

test_prioritized_rr

[         3678 DEBUG] /home/atsushi/awkernel/applications/tests/test_prioritized_rr/src/lib.rs:11: test_prioritized_rr
[         3742 DEBUG] /home/atsushi/awkernel/applications/tests/test_prioritized_rr/src/lib.rs:19: infinite loop task, no=0, priority=0
[         3774 DEBUG] /home/atsushi/awkernel/applications/tests/test_prioritized_rr/src/lib.rs:19: infinite loop task, no=1, priority=1
[         3789 DEBUG] /home/atsushi/awkernel/applications/tests/test_prioritized_rr/src/lib.rs:19: infinite loop task, no=2, priority=0
[         3790 DEBUG] /home/atsushi/awkernel/applications/tests/test_prioritized_rr/src/lib.rs:19: infinite loop task, no=3, priority=1
[         3822 DEBUG] /home/atsushi/awkernel/applications/tests/test_prioritized_rr/src/lib.rs:19: infinite loop task, no=6, priority=0
[         3838 DEBUG] /home/atsushi/awkernel/applications/tests/test_prioritized_rr/src/lib.rs:19: infinite loop task, no=5, priority=1
[         3966 DEBUG] /home/atsushi/awkernel/applications/tests/test_prioritized_rr/src/lib.rs:19: infinite loop task, no=6, priority=0
[         4014 DEBUG] /home/atsushi/awkernel/applications/tests/test_prioritized_rr/src/lib.rs:19: infinite loop task, no=7, priority=1
[         4222 DEBUG] /home/atsushi/awkernel/applications/tests/test_prioritized_rr/src/lib.rs:19: infinite loop task, no=4, priority=0
[         4510 DEBUG] /home/atsushi/awkernel/applications/tests/test_prioritized_rr/src/lib.rs:19: infinite loop task, no=7, priority=1
[         4685 DEBUG] /home/atsushi/awkernel/applications/tests/test_prioritized_rr/src/lib.rs:19: infinite loop task, no=4, priority=0
[         4749 DEBUG] /home/atsushi/awkernel/applications/tests/test_prioritized_rr/src/lib.rs:19: infinite loop task, no=3, priority=1
[         4749 DEBUG] /home/atsushi/awkernel/applications/tests/test_prioritized_rr/src/lib.rs:19: infinite loop task, no=0, priority=0
[         4893 DEBUG] /home/atsushi/awkernel/applications/tests/test_prioritized_rr/src/lib.rs:19: infinite loop task, no=3, priority=1
[         4973 DEBUG] /home/atsushi/awkernel/applications/tests/test_prioritized_rr/src/lib.rs:19: infinite loop task, no=6, priority=0
[         5229 DEBUG] /home/atsushi/awkernel/applications/tests/test_prioritized_rr/src/lib.rs:19: infinite loop task, no=6, priority=0
[         5309 DEBUG] /home/atsushi/awkernel/applications/tests/test_prioritized_rr/src/lib.rs:19: infinite loop task, no=3, priority=1
[         5421 DEBUG] /home/atsushi/awkernel/applications/tests/test_prioritized_rr/src/lib.rs:19: infinite loop task, no=2, priority=0
[         5517 DEBUG] /home/atsushi/awkernel/applications/tests/test_prioritized_rr/src/lib.rs:19: infinite loop task, no=8, priority=0
[         5517 DEBUG] /home/atsushi/awkernel/applications/tests/test_prioritized_rr/src/lib.rs:19: infinite loop task, no=5, priority=1
[         5581 DEBUG] /home/atsushi/awkernel/applications/tests/test_prioritized_rr/src/lib.rs:19: infinite loop task, no=4, priority=0
[         5629 DEBUG] /home/atsushi/awkernel/applications/tests/test_prioritized_rr/src/lib.rs:19: infinite loop task, no=6, priority=0
[         5661 DEBUG] /home/atsushi/awkernel/applications/tests/test_prioritized_rr/src/lib.rs:19: infinite loop task, no=1, priority=1
[         5789 DEBUG] /home/atsushi/awkernel/applications/tests/test_prioritized_rr/src/lib.rs:19: infinite loop task, no=1, priority=1
[         5789 DEBUG] /home/atsushi/awkernel/applications/tests/test_prioritized_rr/src/lib.rs:19: infinite loop task, no=4, priority=0
[         5789 DEBUG] /home/atsushi/awkernel/applications/tests/test_prioritized_rr/src/lib.rs:19: infinite loop task, no=2, priority=0
[         5853 DEBUG] /home/atsushi/awkernel/applications/tests/test_prioritized_rr/src/lib.rs:19: infinite loop task, no=3, priority=1
...

Notes for reviewers

The model checking for PrioritizedRRScheduler is future work: https://star4.slack.com/archives/C054R6DL5KL/p1755674859080839?thread_ts=1755671470.801559&cid=C054R6DL5KL