[Infra] Stop including AdMob in zip builds

[ncooke3]

Fix #14408

• Verify that AdMob is removed from zip and Carthage builds

XCFramework is removed (see diff)

nickcooke@nickcooke-mac2 firebase (main) % diff <(tree -L 2 /Users/nickcooke/Downloads/Firebase-actions-dir/11_15_0/Firebase) <(tree -L 2 /Users/nickcooke/Downloads/Firebase-release-zip-zip-signed/11_15_0/Firebase)
1c1
< /Users/nickcooke/Downloads/Firebase-actions-dir/11_15_0/Firebase
---
> /Users/nickcooke/Downloads/Firebase-release-zip-zip-signed/11_15_0/Firebase
50a51,52
> ├── FirebaseDynamicLinks
> │   └── FirebaseDynamicLinks.xcframework
107a110,112
> ├── Google-Mobile-Ads-SDK
> │   ├── GoogleMobileAds.xcframework
> │   └── UserMessagingPlatform.xcframework
119c124
< 110 directories, 7 files
---
> 115 directories, 7 files

nickcooke@nickcooke-mac2 firebase (main) % diff /Users/nickcooke/Downloads/Firebase-actions-dir/11_15_0/Firebase/METADATA.md /Users/nickcooke/Downloads/Firebase-release-zip-zip-signed/11_15_0/Firebase/METADATA.md 
61a62,64
> ## FirebaseDynamicLinks (~> FirebaseAnalytics)
> - FirebaseDynamicLinks.xcframework
> 
127a131,134
> ## Google-Mobile-Ads-SDK (~> FirebaseAnalytics)
> - GoogleMobileAds.xcframework
> - UserMessagingPlatform.xcframework
> 
161a169
> FirebaseDynamicLinks                   | 11.15.0
178a187
> Google-Mobile-Ads-SDK                  | 12.6.0
183a193
> GoogleUserMessagingPlatform            | 3.0.0

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[paulb777]

LGTM after verification

[ncooke3]

Verified. See PR description.