chore: remove unused proto imports (#104)

- [ ] Regenerate this pull request now.

PiperOrigin-RevId: 468735472

Source-Link: googleapis/googleapis@cfa1b37

Source-Link: googleapis/googleapis-gen@09b7666
Copy-Tag: eyJwIjoiLmdpdGh1Yi8uT3dsQm90LnlhbWwiLCJoIjoiMDliNzY2NjY1NjUxMGY1YjAwYjg5M2YwMDNhMGJhNTc2NmY5ZTI1MCJ9

Author: gcf-owl-bot[bot]

packages/google-api-serviceusage/protos/google/api/serviceusage/v1/resources.proto

@@ -24,7 +24,6 @@ import "google/api/monitoring.proto";
 import "google/api/quota.proto";
 import "google/api/usage.proto";
 import "google/protobuf/api.proto";
-import "google/api/annotations.proto";
 
 option csharp_namespace = "Google.Cloud.ServiceUsage.V1";
 option go_package = "google.golang.org/genproto/googleapis/api/serviceusage/v1;serviceusage";

packages/google-api-serviceusage/protos/google/api/serviceusage/v1beta1/resources.proto

@@ -24,7 +24,6 @@ import "google/api/monitoring.proto";
 import "google/api/quota.proto";
 import "google/api/usage.proto";
 import "google/protobuf/api.proto";
-import "google/api/annotations.proto";
 
 option csharp_namespace = "Google.Api.ServiceUsage.V1Beta1";
 option go_package = "google.golang.org/genproto/googleapis/api/serviceusage/v1beta1;serviceusage";

packages/google-api-serviceusage/protos/google/api/serviceusage/v1beta1/serviceusage.proto

@@ -18,7 +18,6 @@ package google.api.serviceusage.v1beta1;
 
 import "google/api/annotations.proto";
 import "google/api/client.proto";
-import "google/api/field_behavior.proto";
 import "google/api/serviceusage/v1beta1/resources.proto";
 import "google/longrunning/operations.proto";
 import "google/protobuf/field_mask.proto";