fix: Add genappbuilder to CODEOWNERS

[holtskinner]

• Restructure directory to match other client libraries.
  • API name is discoveryengine but the region tag is genappbuilder and the product name is Generative AI App Builder.
  • Java Repo requested I use the API name for the directories.
    • docs(samples): Created Initial Sample for Generative AI app builder - Search java-docs-samples#7827

[snippet-bot]

Here is the summary of changes.

You are about to add 6 region tags.

• discoveryengine/get_operation_sample.py:16, tag genappbuilder_get_operation
• discoveryengine/import_documents_sample.py:16, tag genappbuilder_import_documents
• discoveryengine/list_documents_sample.py:15, tag genappbuilder_list_documents
• discoveryengine/list_operations_sample.py:15, tag genappbuilder_list_operations
• discoveryengine/poll_operation_sample.py:16, tag genappbuilder_poll_operation
• discoveryengine/search_sample.py:16, tag genappbuilder_search

You are about to delete 6 region tags.

• genappbuilder/get_operation_sample.py:16, tag genappbuilder_get_operation
• genappbuilder/import_documents_sample.py:16, tag genappbuilder_import_documents
• genappbuilder/list_documents_sample.py:15, tag genappbuilder_list_documents
• genappbuilder/list_operations_sample.py:15, tag genappbuilder_list_operations
• genappbuilder/poll_operation_sample.py:16, tag genappbuilder_poll_operation
• genappbuilder/search_sample.py:16, tag genappbuilder_search

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