test(request_key): lock in keyctl kind, security family, and unclassified return

Audit of request_key(2) found the tracing implementation already
correct and consistent with the man page and the prior keyctl audit
(task 7v): request_key classifies as KindKeyctl/FamilySecurity, the
BPF handler captures option=-2 sentinel and key_serial=dest_keyring
(args[3]) with no path/string capture of the const char *
type/description/callout_info key-metadata args, and the exit returns
a key serial / -1 that stays UNCLASSIFIED.

Strengthen the dedicated TestClassifyRequestKey beyond a bare kind
check to also assert PathnameField stays empty (string args are key
metadata, not paths), family is Security on enter and exit, and the
return is UNCLASSIFIED — bringing it to parity with the add_key
contrast assertion. No code/generated changes; mage generate produces
no diff.

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

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