test: Add a sample generate_config yaml file.

library_generation/test/resources/integration/google-cloud-java/generation_config.yaml

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+#Required.
+gapic_generator_version: 2.30.0
+#Optional.
+grpc_version: 1.59.1
+#Optional.
+protobuf_version: 3.25.1
+#Required.
+googleapis-commitish: 4512234113a18c1fda1fb0d0ceac8f4b4efe9801
+#Required.
+owlbot-cli-image: sha256:623647ee79ac605858d09e60c1382a716c125fb776f69301b72de1cd35d49409
+#Required.
+synthtool-commitish: 59fe44fde9866a26e7ee4e4450fd79f67f8cf599
+#Required.
+python-version: 3.11.2
+#Optional. The root folder name of generated client libraries. If empty, modules will be created under current folder, useful for single module
+destination-path: google-cloud-java
+#Required.
+libraries:
+    #Required. Can be used for populating the folder name java-{api_shortName}. This is also the destination-name in new-client.py.
+  - api_shortname: asset
+    #Optional. The default value is the title of service yaml
+    name-pretty: Cloud Asset
+    #Required.
+    library_type: GAPIC_AUTO
+    #Optional. The default value is com.google.cloud
+    group_id: com.google.cloud
+    #Optional. The default value is google.cloud.{api_shortname}
+    artifact_id: google.cloud.asset
+    #Optional. The default value is true.
+    requires-billing: true
+    #Optional. The default value is documentation.summary from service yaml
+    api_description:
+    #Optional.
+    product_documentation:
+    #Optional.
+    client_documentation:
+    #Optional.
+    rest_documentation:
+    #Optional.
+    rpc_documentation:
+    #Required.
+    GAPICs:
+        #Required. This is a relative path to googleapis/googleapis. We'll parse all the parameters needed by generate_library.sh from BUILD.bazel in this folder.
+      - proto_path: google/cloud/asset/v1
+      - proto_path: google/cloud/asset/v1p1beta1
+      - proto_path: google/cloud/asset/v1p2beta1
+      - proto_path: google/cloud/asset/v1p5beta1
+      - proto_path: google/cloud/asset/v1p7beta1
+  - api_shortname: speech
+    library_type: GAPIC_AUTO
+    services:
+      - proto_path: google/cloud/asset/v1