BUG: resolved problem with DataFrame.equals() (#28839)
The function was returning True in case shown in added test. The cause
of the problem was sorting Blocks of DataFrame by type, and then
mgr_locs before comparison. It resulted in arranging the identical blocks
in the same way, which resulted in having the same two lists of blocks.
Changing sorting order to (mgr_locs, type) resolves the problem, while not
interrupting the other aspects of comparison.

- [x] closes #28839
- [x] tests added / passed
- [x] passes `black pandas`
- [x] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [x] whatsnew entry
