[terraform] Add blob metric filters and alarms

Summary:
This implements the actual cloudwatch alarms filtering on the errorTypes set up prior in the stack

Depends on D13394

Test Plan: Trigger alarms on AWS Staging through a custom docker image

Reviewers: bartek, varun

Reviewed By: bartek

Subscribers: ashoat, tomek

Differential Revision: https://phab.comm.dev/D13395