BUG: ArrayManager not respecting copy keyword
- [ ] closes #xxxx
- [x] tests added / passed
- [x] Ensure all linting tests pass, see [here](https://pandas.pydata.org/pandas-docs/dev/development/contributing_codebase.html#pre-commit) for how to run them
- [ ] whatsnew entry

@jbrockmendel ok here? i still need to respond to joris's comments looks reasonable, cc @jorisvandenbossche  @jorisvandenbossche if any comments