chore: fix miscellaneous no-unnecessary-condition violations#7834

JoshuaKGoldberg merged 4 commits intotypescript-eslint:maintypescript-eslint/typescript-eslint:mainfrom

JoshuaKGoldberg:lint-enable-no-unnecessary-condition-etcJoshuaKGoldberg/typescript-eslint:lint-enable-no-unnecessary-condition-etcCopy head branch name to clipboard