TST: Added dataframe constructor tests confirming order is preserved with standard Python dicts
- [ ] closes #38033 
- [ ] tests added / passed
- [ ] passes `black pandas`
- [ ] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [ ] whatsnew entry

Adds additional test scenarios that confirm dataframes created with standard Python dicts preserve order as expected.