Find all valid repos on hg.m.o; unhardcode urls
Find all valid repos on hg.m.o; unhardcode urls

Currently we find repos with restricted privileges only, and return None
for non-privileged repos on hg.m.o. Let's find all valid repos. We still
have a check for `cot_restricted_trees` below.

escapewindow/scriptworker,escapewindow/scriptworker,mozilla-releng/scriptworker,mozilla-releng/scriptworker