fix(rule-tester): re-apply updates from main#9180

JoshuaKGoldberg merged 3 commits intotypescript-eslint:v8typescript-eslint/typescript-eslint:v8from

JoshuaKGoldberg:v8-rule-tester-re-mainJoshuaKGoldberg/typescript-eslint:v8-rule-tester-re-mainCopy head branch name to clipboard