Replace 'service:program_name' in Rust generator

Summary: Replace mstch property `service:program_name` with Whisker property for `t_program::name`.

Reviewed By: dtolnay

Differential Revision: D90034985

fbshipit-source-id: 78af2d5f89c98c54c6a3dfe485f4da7932630be2

Author: hchokshi

third-party/thrift/src/thrift/compiler/generate/t_mstch_rust_generator.cc

@@ -1246,8 +1246,7 @@ class rust_mstch_service : public mstch_service {
          {"service:snake", &rust_mstch_service::rust_snake},
          {"service:requestContext?", &rust_mstch_service::rust_request_context},
          {"service:extendedClients",
-          &rust_mstch_service::rust_extended_clients},
-         {"service:program_name", &rust_mstch_service::program_name}});
+          &rust_mstch_service::rust_extended_clients}});
   }
   mstch::node rust_functions();
   mstch::node rust_client_package() {
@@ -1294,7 +1293,6 @@ class rust_mstch_service : public mstch_service {
     }
     return extended_services;
   }
-  mstch::node program_name() { return service_->program()->name(); }
 
   mstch::node rust_all_exceptions();
 

third-party/thrift/src/thrift/compiler/generate/templates/rust/lib/method_metadata.mustache

@@ -15,7 +15,7 @@
   limitations under the License.
 
 }}
-            // From {{service:program_name}}.{{service:name}}:
+            // From {{service:program.name}}.{{service:name}}:
 {{^service:interaction?}}
 {{#service:rustFunctions}}{{^function:starts_interaction?}}
             ::fbthrift::processor::MethodMetadata{