[8.x] [Security Solution] Fixes exception item comment validation on newline chars \n (#202063)#203707

dhurley14 merged 2 commits intoelastic:8.xelastic/kibana:8.xfrom

dhurley14:backport/8.x/pr-202063dhurley14/kibana:backport/8.x/pr-202063Copy head branch name to clipboard