This Revert "BLD-1091: Hide user_partitions from Advanced settings."

This reverts commit c5c3913783dc64284fa446fd081a177df7dca590.

Conflicts:
	common/test/acceptance/tests/test_studio_split_test.py

@cahrens @explorerleslie please review
This code was introduced by Anton to simplify tests for this case in original PR. So it is natural to revert them and them re-merge again as whole PR