Remove script to clean up datadirs

Summary:

This reverts commit 33c055c4f1eca07bd914a5b40a21f92ad82dde9f. (#2295)

Backport of core PR13119
https://github.com/bitcoin/bitcoin/pull/13119/files

Test Plan:

NOP();

Reviewers: #bitcoin_abc, deadalnix

Reviewed By: #bitcoin_abc, deadalnix

Differential Revision: https://reviews.bitcoinabc.org/D3942