Fail more gracefully with https remotes

[isc-tleavitt]

Using portable git 2.39.1 (in case that's relevant)

Hit an issue where it popped up the git credential manager selector as the IRIS service user, causing the session to hang.

Need to investigate at least failing more gracefully when this happens, but maybe even revisit using username/password to authenticate against Git for push/pull/fetch.

[isc-tleavitt]

#279 might end up doing something even better for this case.