Disable token test on forks (#7516)

Author: paulb777

.github/workflows/remoteconfig.yml

@@ -32,8 +32,8 @@ jobs:
           FirebaseRemoteConfig/Tests/SwiftAPI/GoogleService-Info.plist "$plist_secret"
     - name: Generate Access Token for RemoteConfigConsoleAPI in IntegrationTests
       if: matrix.target == 'iOS'
-      run: scripts/generate_access_token.sh "$plist_secret" scripts/gha-encrypted/RemoteConfigSwiftAPI/ServiceAccount.json.gpg
-          FirebaseRemoteConfig/Tests/SwiftAPI/AccessToken.json
+      run: ([ -z $plist_secret ] || scripts/generate_access_token.sh "$plist_secret" scripts/gha-encrypted/RemoteConfigSwiftAPI/ServiceAccount.json.gpg
+          FirebaseRemoteConfig/Tests/SwiftAPI/AccessToken.json)
     - name: BuildAndUnitTest # can be replaced with pod lib lint with CocoaPods 1.10
       run: scripts/third_party/travis/retry.sh scripts/build.sh RemoteConfig ${{ matrix.target }} unit
     - name: Fake Console API Tests