test(aio): add io_submit end-to-end integration coverage

Audit of io_submit tracing (task 0v) confirmed the tracer is correct by
inspection: KindNull (sys_enter_io_ prefix rule) so ctx_id/nr/iocbpp are
opaque and no fd/path is captured; FamilyAIO; return is UNCLASSIFIED (the
return is a count of iocbs submitted, not a byte count, so it must not
inflate READ/WRITE/TRANSFER totals). Enter/exit are paired and timed. No
implementation discrepancy and no docs drift.

Add a genuine end-to-end test: new aio-submit ioworkload scenario sets up
an AIO context and submits one real IOCB_CMD_PWRITE iocb against a temp
file via raw syscalls, then tears the context down. TestAioSubmit asserts
the enter_io_submit tracepoint fires for the AIO family workload.

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

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