Geo SSH proxy push currently impossible when the only
action that happens is branch removal. This fix
works in a way that it waits for flush packet from git
and then checks pkt lines to determine is pack data is expected.
The thing is that git doesnt send pack data when only
branch removal happens. Explanation is in
https://gitlab.com/gitlab-org/gitlab/-/issues/330494

When the shell environment includes SSH_CONNECTION, one spec fails as
the way we're stubbing the environment to the subprocess doesn't wipe
out the pre-existing variable. This commit changes how we do it so the
spec passes even in this environment.

This change removes session duration
information from output of 2fa_verify command

Implements the feature requested in gitlab-org/gitlab#19672

This requires the internal api counterpart in gitlab-org/gitlab!36302 to
be merged first.

It can be used as follows:
```
censored@censored-VirtualBox:~/git/gitlab$ ssh git@gitlab-2004 personal_access_token
remote:
remote: ========================================================================
remote:
remote: Usage: personal_access_token <name> <scope1[,scope2,...]> [ttl_days]
remote:
remote: ========================================================================
remote:

censored@censored-VirtualBox:~/git/gitlab$ ssh git@gitlab-2004 personal_access_token newtoken read_api,read_repository 30
Token:   aAY1G3YPeemECgUvxuXY
Scopes:  read_api,read_repository
Expires: 2020-08-07
```

This restores the previous behavior of logging the success and failures
of internal HTTP requests.

Part of https://gitlab.com/gitlab-org/gitlab/issues/207916