test(integration): add landlock_create_ruleset coverage

Add a Security-family end-to-end scenario + test for
landlock_create_ruleset, which was previously untested.

The new securityLandlockCreateRuleset scenario (registered as
"security-landlock") builds a minimal valid struct
landlock_ruleset_attr{handled_access_fs=LANDLOCK_ACCESS_FS_READ_FILE},
calls landlock_create_ruleset(&attr, sizeof(attr), 0) via raw syscall
(nr=444 on amd64/arm64), and closes the returned ruleset fd. It
tolerates ENOSYS/EOPNOTSUPP (kernel < 5.13 or Landlock LSM disabled)
since the sys_enter tracepoint fires before any such error. It
deliberately never calls landlock_restrict_self, which would
irreversibly sandbox the shared integration-test runner.

TestSecurityLandlockCreateRuleset asserts enter_landlock_create_ruleset
MinCount>=1 and positive duration unconditionally, plus conditional
"landlockfd:" path-prefix assertions on the create/close pair with an
open/close path-stability check.

Verified: TEST_NAME=TestSecurityLandlockCreateRuleset mage testWithName
PASS (kernel 7.0.9); mage build, go build ./cmd/ioworkload/, and
go vet ./integrationtests/ all clean.

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

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