test: close issued-but-unasserted gaps (signals, sched, sysv msgrcv) + fix pidfd_getfd path expectation

signals: TestSignalsBasic issued but never asserted enter_tkill and
enter_rt_sigqueueinfo (both genuinely emitted by sendSelfSignals); add
both MinCount>=1 enter assertions. Both tracepoints were already in
signalsTraceArgs.

sched: TestSchedBasic omitted enter_sched_setaffinity even though
scenario_sched.go re-applies its affinity mask via SchedSetaffinity and
the tracepoint is in schedTraceArgs; add the MinCount>=1 enter assertion.

sysv: TestSysVMsgBasic only checked enter presence + duration for
msgrcv. msgrcv is READ_CLASSIFIED, so add assertEventBytesAtLeast >= 12
("ior-sysv-msg") mirroring the recvfrom/recvmsg byte assertions.

pidfd: verified TestPidfdGetfdSuccess already PASSES deterministically
with PathContains "pidfd-getfd-source.txt". The path is correct and
meaningful: pidfd_getfd is an fd-transfer op, so at exit
applyFdTransferOp re-points the event to the RETURNED dup fd, which for a
self-pidfd refers to the same open source file. Kept the assertion and
added a comment explaining why it resolves to the source file rather than
the pidfd's anon_inode. No BPF/handler change.

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

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