[iOS] Delete libPods-Comm.a dependency

Summary:
This is not needed yet and causes issues on M1.
We probably need that to share the code between the app and notification service extension. This is not implemented yet, so removing it for now doesn't hurt us.
The issue with M1 is that, when the code is checked out, in order to build it, it is required to run pod install (otherwise the app does not build). After running pod install this framework is automatically deleted from the dependency list and the app works correctly.

Test Plan: Check if app builds on both Intel and M1

Reviewers: karol-bisztyga, atul, def-au1t, ashoat

Reviewed By: def-au1t, ashoat

Subscribers: benschac, ashoat, Adrian

Differential Revision: https://phabricator.ashoat.com/D3197