Fix: Android react.gradle VmCleanup when packaging as library (#33179)

Summary:
When packaging a react app as an android library with the enableVmCleanup flag not set to false, an error occurs since the "package${targetName}" task can not be found. This PR adds a simple null check, similar to what is being done for the sTask and mTask just below it to prevent the error.

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[Android] [Fixed] - Fixes android build error when compiling as library

Pull Request resolved: #33179

Test Plan:
Compile project as library (com.android.library), and should not trigger and error with these changes.

Would also like to have this fix cherry-pick'd to release 0.67 after merging.

Reviewed By: ShikaSD

Differential Revision: D34475934

Pulled By: cortinico

fbshipit-source-id: ce6ce43960c4b388c4b1da49a9a6e21fd3bf8e16

packages/react-native-gradle-plugin/src/main/kotlin/com/facebook/react/TaskConfiguration.kt

@@ -126,7 +126,7 @@ internal fun Project.configureReactTasks(variant: BaseVariant, config: ReactExte
   // Android configuration
   variant.registerGeneratedResFolders(generatedResFolders)
 
-  val packageTask =
+  val packageTask: TaskProvider<out Task>? =
       when (variant) {
         is ApplicationVariant -> variant.packageApplicationProvider
         is LibraryVariant -> variant.packageLibraryProvider
@@ -154,11 +154,11 @@ internal fun Project.configureReactTasks(variant: BaseVariant, config: ReactExte
           it.enabled = bundleEnabled
         }
 
-    packageTask.dependsOn(currentCopyResTask)
+    packageTask?.dependsOn(currentCopyResTask)
     preBundleTask.dependsOn(currentCopyResTask)
   }
 
-  packageTask.configure {
+  packageTask?.configure {
     if (config.enableVmCleanup.get()) {
       val libDir = "$buildDir/intermediates/transforms/"
       val targetVariant = ".*/transforms/[^/]*/${variant.name}/.*".toRegex()
@@ -207,7 +207,7 @@ internal fun Project.configureReactTasks(variant: BaseVariant, config: ReactExte
   // from Android plugin 4.1+.
   // This ensures to copy the bundle file before mergeResources task starts
   mergeResourcesTask.dependsOn(currentAssetsCopyTask)
-  packageTask.dependsOn(currentAssetsCopyTask)
+  packageTask?.dependsOn(currentAssetsCopyTask)
   preBundleTask.dependsOn(currentAssetsCopyTask)
 }
 

react.gradle

@@ -395,8 +395,10 @@ afterEvaluate {
 
         if (enableVmCleanup) {
             def task = tasks.findByName("package${targetName}")
-            def transformsLibDir = "$buildDir/intermediates/transforms/"
-            task.doFirst { vmSelectionAction(transformsLibDir) }
+            if (task != null) {
+                def transformsLibDir = "$buildDir/intermediates/transforms/"
+                task.doFirst { vmSelectionAction(transformsLibDir) }
+            }
 
             def sTask = tasks.findByName("strip${targetName}DebugSymbols")
             if (sTask != null) {