[Infra] Remove Firebase Dynamic Links from the InAppMessaging sample applications.

[ncooke3]

Previously, Firebase Dynamic Links was used in the InAppMessaging-Example-iOS and fiam-external-ios-testing-app sample applications for handling deep links.

With this change, all usage of Firebase Dynamic Links has been removed from these sample apps:

• I removed the FirebaseDynamicLinks import and related code from InAppMessaging-Example-iOS/AppDelegate.m.
• I removed the FirebaseDynamicLinks pod dependency from InAppMessaging-Example-iOS's Podfile.
• I removed FIRDynamicLinks usage from fiam-external-ios-testing-app/AppDelegate.m.
• I removed the Firebase/DynamicLinks pod dependency from fiam-external-ios-testing-app's Podfile.

The sample apps no longer rely on Firebase Dynamic Links for their functionality.

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[paulb777]

LGTM on green