feat!: [dataform] remove deprecated v1alpha2 (#11481)

* chore: remove v1alpha2 from dataform

* delete removed modules from google-cloud-dataform-parent pom

Author: zhumin8

generation_config.yaml

@@ -681,7 +681,6 @@ libraries:
   product_documentation: https://cloud.google.com/dataform/docs
   api_description: Help analytics teams manage data inside BigQuery using SQL.
   GAPICs:
-  - proto_path: google/cloud/dataform/v1alpha2
   - proto_path: google/cloud/dataform/v1beta1
 
 - api_shortname: datalabeling

java-dataform/google-cloud-dataform-bom/pom.xml

@@ -29,21 +29,11 @@
         <artifactId>google-cloud-dataform</artifactId>
         <version>0.59.0-SNAPSHOT</version><!-- {x-version-update:google-cloud-dataform:current} -->
       </dependency>
-      <dependency>
-        <groupId>com.google.api.grpc</groupId>
-        <artifactId>grpc-google-cloud-dataform-v1alpha2</artifactId>
-        <version>0.59.0-SNAPSHOT</version><!-- {x-version-update:grpc-google-cloud-dataform-v1alpha2:current} -->
-      </dependency>
       <dependency>
         <groupId>com.google.api.grpc</groupId>
         <artifactId>grpc-google-cloud-dataform-v1beta1</artifactId>
         <version>0.59.0-SNAPSHOT</version><!-- {x-version-update:grpc-google-cloud-dataform-v1beta1:current} -->
       </dependency>
-      <dependency>
-        <groupId>com.google.api.grpc</groupId>
-        <artifactId>proto-google-cloud-dataform-v1alpha2</artifactId>
-        <version>0.59.0-SNAPSHOT</version><!-- {x-version-update:proto-google-cloud-dataform-v1alpha2:current} -->
-      </dependency>
       <dependency>
         <groupId>com.google.api.grpc</groupId>
         <artifactId>proto-google-cloud-dataform-v1beta1</artifactId>

java-dataform/google-cloud-dataform/pom.xml

@@ -45,10 +45,6 @@
       <groupId>com.google.api.grpc</groupId>
       <artifactId>proto-google-cloud-dataform-v1beta1</artifactId>
     </dependency>
-    <dependency>
-      <groupId>com.google.api.grpc</groupId>
-      <artifactId>proto-google-cloud-dataform-v1alpha2</artifactId>
-    </dependency>
     <dependency>
       <groupId>com.google.guava</groupId>
       <artifactId>guava</artifactId>
@@ -92,11 +88,6 @@
       <scope>test</scope>
     </dependency>
 
-    <dependency>
-      <groupId>com.google.api.grpc</groupId>
-      <artifactId>grpc-google-cloud-dataform-v1alpha2</artifactId>
-      <scope>test</scope>
-    </dependency>
     <!-- Need testing utility classes for generated gRPC clients tests -->
     <dependency>
       <groupId>com.google.api</groupId>