[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](https://web.comm.app/chat/thread/256|79019391/) 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

services/terraform/remote/service_identity.tf

@@ -1,5 +1,5 @@
 locals {
-  identity_service_image_tag      = local.is_staging ? "0.35-staging" : "0.35"
+  identity_service_image_tag      = local.is_staging ? "0.36" : "0.35"
   identity_service_server_image   = "commapp/identity-server:${local.identity_service_image_tag}"
   identity_service_container_name = "identity-server"