Cleanup partial rendering feature flag

Summary: (Finally) removes the feature flag for partial rendering, making partial rendering the default unless overridden by the unstable environment configuration.

Reviewed By: davidmccabe

Differential Revision: D45365186

fbshipit-source-id: 979f540a9b69bcd5ec358de7b4355d7eca89ec8e

packages/relay-runtime/store/RelayModernEnvironment.js

@@ -136,10 +136,7 @@ class RelayModernEnvironment implements IEnvironment {
     this.requiredFieldLogger =
       config.requiredFieldLogger ?? defaultRequiredFieldLogger;
     this._defaultRenderPolicy =
-      config.UNSTABLE_defaultRenderPolicy ??
-      RelayFeatureFlags.ENABLE_PARTIAL_RENDERING_DEFAULT === true
-        ? 'partial'
-        : 'full';
+      config.UNSTABLE_defaultRenderPolicy ?? 'partial';
     this._operationLoader = operationLoader;
     this._operationExecutions = new Map();
     this._network = wrapNetworkWithLogObserver(this, config.network);

packages/relay-runtime/util/RelayFeatureFlags.js

@@ -16,7 +16,6 @@ import type {Disposable} from '../util/RelayRuntimeTypes';
 export type FeatureFlags = {
   ENABLE_CLIENT_EDGES: boolean,
   ENABLE_VARIABLE_CONNECTION_KEY: boolean,
-  ENABLE_PARTIAL_RENDERING_DEFAULT: boolean,
   ENABLE_REACT_FLIGHT_COMPONENT_FIELD: boolean,
   ENABLE_RELAY_RESOLVERS: boolean,
   ENABLE_GETFRAGMENTIDENTIFIER_OPTIMIZATION: boolean,
@@ -46,7 +45,6 @@ export type FeatureFlags = {
 const RelayFeatureFlags: FeatureFlags = {
   ENABLE_CLIENT_EDGES: false,
   ENABLE_VARIABLE_CONNECTION_KEY: false,
-  ENABLE_PARTIAL_RENDERING_DEFAULT: true,
   ENABLE_REACT_FLIGHT_COMPONENT_FIELD: false,
   ENABLE_RELAY_RESOLVERS: false,
   ENABLE_GETFRAGMENTIDENTIFIER_OPTIMIZATION: false,