TST: Add tests for num-bool coercion
Boolean dtypes in both Series and DataFrames should be coerced
to the other operand's dtype.

- [x] closes #18549
- [x] tests added / passed
- [x] passes `black pandas`
- [x] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [ ] whatsnew entry
