fix(eslint-plugin): [strict-boolean-expressions] support mixed enums in allowNullableEnum option#6740

JoshuaKGoldberg merged 5 commits intotypescript-eslint:maintypescript-eslint/typescript-eslint:mainfrom

kozlovvski:6737-strict-boolean-expressions-handle-mixed-enumskozlovvski/typescript-eslint:6737-strict-boolean-expressions-handle-mixed-enumsCopy head branch name to clipboard