Invalid warning on command line when over plan limit for http (BB-6305)

When pushing over https, users may see an error similar to the following:

#!bash

The requested URL returned error: 403 while accessing https://{username}@bitbucket.org/{username}/{repo slug}.git/info/refs
fatal: HTTP request failed

This is a bug. Instead the message should tell users that the account they are trying to push to is over their plan limit.