rc: Use check_jail to check values of security.jail MIBs
PR: 282404
Reviewed by: markj, netchild
Approved by: markj (mentor)
MFC after: 2 weeks
Event: Berlin Hackathon 202507
Differential Revision: https://reviews.freebsd.org/D47329
(cherry picked from commit 46f18ecf8d3cdda1cd433841c44a4c1268ab9721)