fix(rule-tester): normalize paths before checking if they escape cwd#11525

JoshuaKGoldberg merged 3 commits intotypescript-eslint:maintypescript-eslint/typescript-eslint:mainfrom

dbarabashh:fix/rule-tester-normalize-pathsdbarabashh/typescript-eslint:fix/rule-tester-normalize-pathsCopy head branch name to clipboard