Remove REACT_NATIVE_SKIP_PREFAB as unused (#41833)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/41833

I'm removing those environment variables as they're legacy and not used anymore:
- REACT_NATIVE_SKIP_PREFAB
- REACT_NATIVE_HERMES_SKIP_PREFAB

Changelog:
[Internal] [Changed] - Remove REACT_NATIVE_SKIP_PREFAB as unused

Reviewed By: dmytrorykun

Differential Revision: D51890227

fbshipit-source-id: 6579ff73d3030fe1acb587250cd99aff44a1de29

packages/react-native/ReactAndroid/build.gradle.kts

@@ -60,9 +60,6 @@ val dependenciesPath = System.getenv("REACT_NATIVE_DEPENDENCIES")
 // and the build will use that.
 val boostPathOverride = dependenciesPath ?: System.getenv("REACT_NATIVE_BOOST_PATH")
 
-// By setting REACT_NATIVE_SKIP_PREFAB we can skip prefab publishing, to
-// reduce the size of the React Native published .AAR.
-val skipPrefabPublishing = System.getenv("REACT_NATIVE_SKIP_PREFAB") != null
 val prefabHeadersDir = project.file("$buildDir/prefab-headers")
 
 // Native versions which are defined inside the version catalog (libs.versions.toml)
@@ -635,7 +632,7 @@ android {
 
   buildFeatures {
     prefab = true
-    prefabPublishing = !skipPrefabPublishing
+    prefabPublishing = true
     buildConfig = true
   }
 

packages/react-native/ReactAndroid/hermes-engine/build.gradle

@@ -63,10 +63,6 @@ if (hermesVersionFile.exists()) {
 def ndkBuildJobs = Runtime.runtime.availableProcessors().toString()
 def prefabHeadersDir = new File("$buildDir/prefab-headers")
 
-// By setting REACT_NATIVE_HERMES_SKIP_PREFAB you can skip prefab publishing, to
-// reduce the size of the Hermes published .AAR.
-def skipPrefabPublishing = System.getenv("REACT_NATIVE_HERMES_SKIP_PREFAB") != null
-
 // We inject the JSI directory used inside the Hermes build with the -DJSI_DIR config.
 def jsiDir = new File(reactNativeRootDir, "ReactCommon/jsi")
 
@@ -245,7 +241,7 @@ android {
 
     buildFeatures {
         prefab true
-        prefabPublishing !skipPrefabPublishing
+        prefabPublishing true
     }
 
     dependencies {