sync config structure with that of google-cloud-java

Author: diegomarquezp

generation_config.yaml

@@ -1,18 +1,8 @@
 gapic_generator_version: 2.41.0
-protoc_version: '25.3'
 googleapis_commitish: 6f289d775912966eb0cf04bda91e5e355c998d30
 libraries_bom_version: 26.38.0
-template_excludes:
-  - .gitignore
-  - .github/CODEOWNERS
-  - .github/blunderbuss.yml
-  - CONTRIBUTING.md
-  - .kokoro/requirements.in
-  - .kokoro/requirements.txt
-  - .kokoro/presubmit/graalvm-native.cfg
-  - .kokoro/presubmit/graalvm-native-17.cfg
 libraries:
-  - api_shortname: "logging"
+  - api_shortname: logging
     name_pretty: "Cloud Logging"
     product_documentation: "https://cloud.google.com/logging/docs"
     client_documentation: "https://cloud.google.com/java/docs/reference/google-cloud-logging/latest/history"