test(integration): add Sched family tracing coverage

Add a self-targeted, non-disruptive sched-basic ioworkload scenario and a
dedicated TestSchedBasic integration test. The scenario pins to one OS thread
(LockOSThread) and exercises only safe Sched syscalls: sched_yield;
sched_getaffinity then sched_setaffinity re-applying the identical mask (a
no-op); and read-only sched_getscheduler, sched_getparam, sched_getattr,
sched_get_priority_max/min, and sched_rr_get_interval. sched_setscheduler,
sched_setattr, and sched_setparam are intentionally excluded.

The test scopes -trace-syscalls to the sched_* family, guards on PID and comm,
and asserts enter_ tracepoints fire (MinCount>=1) for sched_yield,
sched_getaffinity, sched_getscheduler, and sched_getparam.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

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