iOS: Remove Analytics dependency from GMA integration test (#1386)

* Try using CoreOnly instead of Analytics cocoapod for tests.

* Update readme.

Author: jonsimantov

gma/integration_test/Podfile

@@ -4,7 +4,7 @@ platform :ios, '11.0'
 use_frameworks! :linkage => :static
 
 target 'integration_test' do
-  pod 'Firebase/Analytics', '10.12.0'
+  pod 'Firebase/CoreOnly', '10.12.0'
   pod 'Google-Mobile-Ads-SDK', '10.8.0'
 end
 

release_build_files/readme.md

@@ -250,7 +250,7 @@ Firebase Functions         | firebase_functions.xcframework
 |                          | Firebase/Auth Cocoapod (10.12.0)
 Google Mobile Ads          | firebase_gma.xcframework
 |                          | firebase.xcframework
-|                          | Firebase/Analytics Cocoapod (10.12.0)
+|                          | Firebase/CoreOnly Cocoapod (10.12.0)
 |                          | Google-Mobile-Ads-SDK Cocoapod (10.8.0)
 Firebase Installations     | firebase_installations.xcframework
 |                          | firebase.xcframework
@@ -312,7 +312,7 @@ Firebase Functions         | libfirebase_functions.a
 |                          | Firebase/Auth Cocoapod (10.12.0)
 Google Mobile Ads          | libfirebase_gma.a
 |                          | libfirebase_app.a
-|                          | Firebase/Analytics Cocoapod (10.12.0)
+|                          | Firebase/CoreOnly Cocoapod (10.12.0)
 |                          | Google-Mobile-Ads-SDK Cocoapod (10.8.0)
 Firebase Installations     | libfirebase_installations.a
 |                          | libfirebase_app.a