The migration contains a bug which causes project.config to become
unreadable, breaking a site until it is fixed. A fix is in progress[1],
but there are still some open questions that we don't have answers to.
Revert the functionality for now, to give us time to fully bake a fix.
This reverts the following commits:
9ff07177ea8392e982c066c52dae95642f3e07e7
[1] https://gerrit-review.googlesource.com/c/gerrit/+/173513
Change-Id: I139ba7aa97a946f2c31258e7dfaa3a94ee72ff6e