fix(dataform): remove v1alpha2 client (googleapis#11761)

Fixes: googleapis#11760

Author: codyoss

.github/.OwlBot.yaml

@@ -95,7 +95,6 @@ deep-remove-regex:
   - /datacatalog/apiv1beta1/
   - /datacatalog/lineage/apiv1/
   - /dataflow/apiv1beta3/
-  - /dataform/apiv1alpha2/
   - /dataform/apiv1beta1/
   - /datafusion/apiv1/
   - /datalabeling/apiv1beta1/
@@ -232,7 +231,6 @@ deep-remove-regex:
   - /internal/generated/snippets/datacatalog/apiv1beta1/
   - /internal/generated/snippets/datacatalog/lineage/apiv1/
   - /internal/generated/snippets/dataflow/apiv1beta3/
-  - /internal/generated/snippets/dataform/apiv1alpha2/
   - /internal/generated/snippets/dataform/apiv1beta1/
   - /internal/generated/snippets/datafusion/apiv1/
   - /internal/generated/snippets/datalabeling/apiv1beta1/
@@ -815,8 +813,6 @@ deep-copy-regex:
     dest: /
   - source: /google/dataflow/v1beta3/cloud.google.com/go
     dest: /
-  - source: /google/cloud/dataform/v1alpha2/cloud.google.com/go
-    dest: /
   - source: /google/cloud/dataform/v1beta1/cloud.google.com/go
     dest: /
   - source: /google/cloud/datafusion/v1/cloud.google.com/go