fix: revert "feat: [marketingplatformadminapi] new module for marketingplatformadminapi (#11194)" (#11196)

This reverts commit 0101f3a.

Co-authored-by: Lawrence Qiu <lawrenceqiu@google.com>

Author: suztomo

generation_config.yaml

@@ -1352,24 +1352,6 @@ libraries:
   - proto_path: google/maps/solar/v1
   requires_billing: true
   rpc_documentation: https://developers.google.com/maps/documentation/solar/reference/rest
-- api_shortname: marketingplatformadminapi
-  name_pretty: Google Marketing Platform Admin API
-  product_documentation: https://developers.google.com/analytics/devguides/config/gmp/v1
-  api_description: The Google Marketing Platform Admin API allows for programmatic
-    access to the Google Marketing Platform configuration data. You can use the Google
-    Marketing Platform Admin API to manage links between your Google Marketing Platform
-    organization and Google Analytics accounts, and to set the service level of your
-    GA4 properties.
-  client_documentation: https://cloud.google.com/java/docs/reference/admin/latest/overview
-  release_level: preview
-  distribution_name: com.google.ads-marketingplatform:admin
-  api_id: marketingplatformadminapi.googleapis.com
-  library_type: GAPIC_AUTO
-  group_id: com.google.ads-marketingplatform
-  cloud_api: false
-  GAPICs:
-  - proto_path: google/marketingplatform/admin/v1alpha
-  requires_billing: true
 - api_shortname: mediatranslation
   name_pretty: Media Translation API
   product_documentation: https://cloud.google.com/