[terraform] create backup cloudwatch alarms
Summary:
This creates the backup cloudwatch alarms that were added to backup in https://phab.comm.dev/D13942
Depends on D13943
Test Plan:
Triggered alarms by including tracing error logs with each newly implemented errorType in the main.rs file in backup. Confirmed that alarms were triggered and emails were sent.
Linear issues were also created for error log alarms
Reviewers: bartek, varun
Reviewed By: bartek, varun
Subscribers: ashoat, tomek
Differential Revision: https://phab.comm.dev/D13944