Fix enableVmCleanup not working for apps with product flavors.

Summary:
While working on the NDK AGP Api I realized that the `enableVmCleanup` function,
that is supposed to cleanup the extra `.so` files from the final artifacts, is broken
for apps with variants. Specifically say for a `liteDebug` app it tries to search for `.so` files inside:

```
intermediates/stripped_native_libs/lite/debug/out/lib
```

while the `.so` files are located inside:

```
intermediates/stripped_native_libs/liteDebug/out/lib
```

I've fixed changing the token of the path from `targetPath` to `variant.name`

Changelog:
[Android] [Fixed] - Fix enableVmCleanup not working for apps with product flavors

Reviewed By: ShikaSD

Differential Revision: D31654704

fbshipit-source-id: 50998fd0f7384c153f36367f8abcc20746ab0945

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

@@ -165,23 +165,23 @@ internal fun Project.configureReactTasks(variant: BaseVariant, config: ReactExte
   packageTask.configure {
     if (config.enableVmCleanup.get()) {
       val libDir = "$buildDir/intermediates/transforms/"
-      val targetVariant = ".*/transforms/[^/]*/$targetPath/.*".toRegex()
+      val targetVariant = ".*/transforms/[^/]*/${variant.name}/.*".toRegex()
       it.doFirst { cleanupVMFiles(libDir, targetVariant, enableHermes, cleanup) }
     }
   }
 
   stripDebugSymbolsTask?.configure {
     if (config.enableVmCleanup.get()) {
-      val libDir = "$buildDir/intermediates/stripped_native_libs/${targetPath}/out/lib/"
-      val targetVariant = ".*/stripped_native_libs/$targetPath/out/lib/.*".toRegex()
+      val libDir = "$buildDir/intermediates/stripped_native_libs/${variant.name}/out/lib/"
+      val targetVariant = ".*/stripped_native_libs/${variant.name}/out/lib/.*".toRegex()
       it.doLast { cleanupVMFiles(libDir, targetVariant, enableHermes, cleanup) }
     }
   }
 
   mergeNativeLibsTask?.configure {
     if (config.enableVmCleanup.get()) {
-      val libDir = "$buildDir/intermediates/merged_native_libs/${targetPath}/out/lib/"
-      val targetVariant = ".*/merged_native_libs/$targetPath/out/lib/.*".toRegex()
+      val libDir = "$buildDir/intermediates/merged_native_libs/${variant.name}/out/lib/"
+      val targetVariant = ".*/merged_native_libs/${variant.name}/out/lib/.*".toRegex()
       it.doLast { cleanupVMFiles(libDir, targetVariant, enableHermes, cleanup) }
     }
   }

react.gradle

@@ -369,9 +369,9 @@ afterEvaluate {
                     }
                 }
             }.visit { details ->
-                def targetVariant1 = ".*/transforms/[^/]*/${targetPath}/.*"
-                def targetVariant2 = ".*/merged_native_libs/${targetPath}/out/lib/.*"
-                def targetVariant3 = ".*/stripped_native_libs/${targetPath}/out/lib/.*"
+                def targetVariant1 = ".*/transforms/[^/]*/${variant.name}/.*"
+                def targetVariant2 = ".*/merged_native_libs/${variant.name}/out/lib/.*"
+                def targetVariant3 = ".*/stripped_native_libs/${variant.name}/out/lib/.*"
                 def path = details.file.getAbsolutePath().replace(File.separatorChar, '/' as char)
                 if ((path.matches(targetVariant1) || path.matches(targetVariant2) || path.matches(targetVariant3)) && details.file.isFile()) {
                     details.file.delete()
@@ -386,13 +386,13 @@ afterEvaluate {
 
             def sTask = tasks.findByName("strip${targetName}DebugSymbols")
             if (sTask != null) {
-                def strippedLibDir = "$buildDir/intermediates/stripped_native_libs/${targetPath}/out/lib/"
+                def strippedLibDir = "$buildDir/intermediates/stripped_native_libs/${variant.name}/out/lib/"
                 sTask.doLast { vmSelectionAction(strippedLibDir) }
             }
 
             def mTask = tasks.findByName("merge${targetName}NativeLibs")
             if (mTask != null) {
-                def mergedLibDir = "$buildDir/intermediates/merged_native_libs/${targetPath}/out/lib/"
+                def mergedLibDir = "$buildDir/intermediates/merged_native_libs/${variant.name}/out/lib/"
                 mTask.doLast { vmSelectionAction(mergedLibDir) }
             }
         }