test(utime): add end-to-end coverage for futimesat and utimensat

utime_test.go previously covered only utime/utimes/ENOENT. Add scenarios
and tests for the dirfd-relative siblings futimesat(2) and utimensat(2),
which take a dirfd at args[0] and the pathname at args[1]. Both scenarios
use raw syscalls with AT_FDCWD as the dirfd so the exact enter_futimesat
and enter_utimensat tracepoints fire, and the tests assert PathContains
the filename, proving ior captures the path from args[1] (after the
dirfd). Classification/tracing were already verified by audits qt/f10;
this is pure coverage.

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

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