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
Copy-Tag: eyJwIjoiYXBpcy9Hb29nbGUuQ2xvdWQuQ29tcHV0ZS5WMS8uT3dsQm90LnlhbWwiLCJoIjoiMjY0OTU4MjU3YzUzNTJkYjBiYzkxMGMwMGYxNDdiODIxYjAxMDYzNiJ9

apis/Google.Cloud.Compute.V1/Google.Cloud.Compute.V1/Compute.g.cs

@@ -12880,12 +12880,11 @@ static ComputeReflection() {
             "c9pBB3Byb2plY3QapAHKQRZjb21wdXRlLmdvb2dsZWFwaXMuY29t0kGHAWh0",
             "dHBzOi8vd3d3Lmdvb2dsZWFwaXMuY29tL2F1dGgvY29tcHV0ZS5yZWFkb25s",
             "eSxodHRwczovL3d3dy5nb29nbGVhcGlzLmNvbS9hdXRoL2NvbXB1dGUsaHR0",
-            "cHM6Ly93d3cuZ29vZ2xlYXBpcy5jb20vYXV0aC9jbG91ZC1wbGF0Zm9ybUKw",
-            "AQobY29tLmdvb2dsZS5jbG91ZC5jb21wdXRlLnYxUAFaPmdvb2dsZS5nb2xh",
-            "bmcub3JnL2dlbnByb3RvL2dvb2dsZWFwaXMvY2xvdWQvY29tcHV0ZS92MTtj",
-            "b21wdXRlqgIXR29vZ2xlLkNsb3VkLkNvbXB1dGUuVjHKAhdHb29nbGVcQ2xv",
-            "dWRcQ29tcHV0ZVxWMeoCGkdvb2dsZTo6Q2xvdWQ6OkNvbXB1dGU6OlYxYgZw",
-            "cm90bzM="));
+            "cHM6Ly93d3cuZ29vZ2xlYXBpcy5jb20vYXV0aC9jbG91ZC1wbGF0Zm9ybUKd",
+            "AQobY29tLmdvb2dsZS5jbG91ZC5jb21wdXRlLnYxUAFaK2Nsb3VkLmdvb2ds",
+            "ZS5jb20vZ28vY29tcHV0ZS9hcGl2MS9jb21wdXRlcGKqAhdHb29nbGUuQ2xv",
+            "dWQuQ29tcHV0ZS5WMcoCF0dvb2dsZVxDbG91ZFxDb21wdXRlXFYx6gIaR29v",
+            "Z2xlOjpDbG91ZDo6Q29tcHV0ZTo6VjFiBnByb3RvMw=="));
       descriptor = pbr::FileDescriptor.FromGeneratedCode(descriptorData,
           new pbr::FileDescriptor[] { global::Google.Api.AnnotationsReflection.Descriptor, global::Google.Api.ClientReflection.Descriptor, global::Google.Api.FieldBehaviorReflection.Descriptor, global::Google.Api.ResourceReflection.Descriptor, global::Google.Cloud.ExtendedOperationsReflection.Descriptor, },
           new pbr::GeneratedClrTypeInfo(null, null, new pbr::GeneratedClrTypeInfo[] {