bug(auth): Statsd not passed to lib/push

[dschom]

Because

• Found an artifact of this in our logs.

This pull request

• Passes statsd in

Issue that this pull request solves

Closes: FXA-13169

Checklist

Put an x in the boxes that apply

• My commit is GPG signed.
• If applicable, I have modified or added tests which pass locally.
• I have added necessary documentation (if appropriate).
• I have verified that my changes render correctly in RTL (if appropriate).

Screenshots (Optional)

Please attach the screenshots of the changes made in case of change in user interface.

Other information (Optional)

It's a little funny that this wasn't showing up in sentry, but it was in logs. I'm still investigating the root cause of this.