[terraform] bump staging identity to 0.36

Summary:
i've dropped the -staging suffix because there doesn't seem to be any benefit. we discussed this in this thread last week.

i've also tagged the commit on GitHub

Test Plan: terraform plan

Reviewers: ashoat, will, bartek

Reviewed By: will

Subscribers: tomek

Differential Revision: https://phab.comm.dev/D13302