Revert generating project prefixes for resolver files

Summary:
Adding project prefix didn't solve the problems we have with multi-project setup and resolvers.

We need to re-thing what is the most proper solution, but for now - let's revert the project prefix generation.

Reviewed By: captbaritone

Differential Revision: D48870532

fbshipit-source-id: a14f96afe65387de43db11d916b6980764e21f2e

compiler/crates/relay-compiler/src/artifact_map.rs

@@ -56,8 +56,8 @@ impl ArtifactMap {
             },
         };
 
-        for source_definition_name in artifact.artifact_source_keys {
-            match self.0.entry(source_definition_name) {
+        for source_key in artifact.artifact_source_keys {
+            match self.0.entry(source_key) {
                 Entry::Occupied(mut entry) => {
                     entry.get_mut().push(artifact_tuple.clone());
                 }

compiler/crates/relay-config/src/project_name.rs

@@ -28,10 +28,7 @@ impl ProjectName {
         field_name: StringKey,
     ) -> String {
         match self {
-            ProjectName::Named(project_name) => {
-                format!("{}_{}__{}", project_name, object_name, field_name)
-            }
-            ProjectName::Default => format!("{}__{}", object_name, field_name),
+            _ => format!("{}__{}", object_name, field_name),
         }
     }
 }