chore: migrate to owlbot

[Neenu1995]

feat: Add/Update API definitions for Cloud Channel API, including
feat: Update descriptions of APIs.
feat: Add additional_bindings to HTTP annotations of Customer related APIs (list/create/get/update/delete).
feat: Add a new LookupOffer RPC and LookupOfferRequest proto.
feat: Add a new enum value LICENSE_CAP_CHANGED to enum EntitlementEvent.Type

[generated-files-bot]

Warning: This pull request is touching the following templated files:

• google-cloud-channel/src/main/java/com/google/cloud/channel/v1/CloudChannelServiceClient.java
• google-cloud-channel/src/main/java/com/google/cloud/channel/v1/CloudChannelServiceSettings.java
• google-cloud-channel/src/main/java/com/google/cloud/channel/v1/gapic_metadata.json
• google-cloud-channel/src/main/java/com/google/cloud/channel/v1/stub/CloudChannelServiceStub.java
• google-cloud-channel/src/main/java/com/google/cloud/channel/v1/stub/CloudChannelServiceStubSettings.java
• google-cloud-channel/src/main/java/com/google/cloud/channel/v1/stub/GrpcCloudChannelServiceStub.java
• google-cloud-channel/src/test/java/com/google/cloud/channel/v1/CloudChannelServiceClientTest.java
• google-cloud-channel/src/test/java/com/google/cloud/channel/v1/MockCloudChannelServiceImpl.java
• grpc-google-cloud-channel-v1/src/main/java/com/google/cloud/channel/v1/CloudChannelServiceGrpc.java
• proto-google-cloud-channel-v1/src/main/java/com/google/cloud/channel/v1/ContactInfo.java
• proto-google-cloud-channel-v1/src/main/java/com/google/cloud/channel/v1/ContactInfoOrBuilder.java
• proto-google-cloud-channel-v1/src/main/java/com/google/cloud/channel/v1/Customer.java
• proto-google-cloud-channel-v1/src/main/java/com/google/cloud/channel/v1/CustomerOrBuilder.java
• proto-google-cloud-channel-v1/src/main/java/com/google/cloud/channel/v1/EntitlementEvent.java
• proto-google-cloud-channel-v1/src/main/java/com/google/cloud/channel/v1/ServiceProto.java
• proto-google-cloud-channel-v1/src/main/java/com/google/cloud/channel/v1/SubscriberEventProto.java
• proto-google-cloud-channel-v1/src/main/proto/google/cloud/channel/v1/customers.proto
• proto-google-cloud-channel-v1/src/main/proto/google/cloud/channel/v1/service.proto
• proto-google-cloud-channel-v1/src/main/proto/google/cloud/channel/v1/subscriber_event.proto

[snippet-bot]

No region tags are edited in this PR.

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