test(getsockname): lock in KindFd/FamilyNetwork/UNCLASSIFIED classification

Audit of getsockname(2) confirmed correct tracing: enter is KindFd with
the sockfd captured from args[0], family is FamilyNetwork, and the exit
ret_event is UNCLASSIFIED (0/-1, no byte count) — matching the man page
and its bind/connect/listen/accept/getpeername siblings. Integration
coverage already exists (ioworkload calls Getsockname; TestSocketIntro-
spection asserts enter_getsockname).

Add lock-in tests symmetric with the existing getpeername coverage:
- TestClassifyExitGetsockname: exit tracepoint maps to KindRet.
- TestGenerateGetsocknameHandler: enter captures fd=args[0]; the addr
  output pointer (args[1]) and addrlen in/out pointer (args[2]) are not
  captured, and the exit stays UNCLASSIFIED.
- FormatGetsockname/FormatExitGetsockname fixtures copied verbatim from
  the real kernel tracepoint format (third arg is a pointer, unlike
  bind's by-value addrlen).

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

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