chore: [compute] add Go build targets for compute (#792) (#4157)

* chore: add Go build targets for compute (#792)

Note: manually updated proto file, but it yields the same result of the new disco-converter would generate.

Fixes: googleapis/google-cloud-go#7345
Source-Link: googleapis/googleapis@59828ba

Source-Link: googleapis/googleapis-gen@2649582
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* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

---------

Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>
Co-authored-by: danieljbruce <danieljbruce@users.noreply.github.com>

packages/google-cloud-compute/protos/google/cloud/compute/v1/compute.proto

@@ -32,7 +32,7 @@ import "google/cloud/extended_operations.proto";
 // File Options
 //
 option csharp_namespace = "Google.Cloud.Compute.V1";
-option go_package = "google.golang.org/genproto/googleapis/cloud/compute/v1;compute";
+option go_package = "cloud.google.com/go/compute/apiv1/computepb";
 option java_multiple_files = true;
 option java_package = "com.google.cloud.compute.v1";
 option php_namespace = "Google\\Cloud\\Compute\\V1";