Fix detecting when Gradle is invoked from Studio

The existing 'idea.platform.prefix' system-property approach
only worked because of a Android Studio bug that leaks the
system properties from Android Studio into Gradle build:
  - https://issuetracker.google.com/201075423

This bug was fixed in Android Studio 2023.3.1 (Jellyfish).

The correct way of identifying builds from Android Studio is to
use the following project property (not system property):
 - android.injected.invoked.from.ide

platform/android/java/app/config.gradle

@@ -330,8 +330,7 @@ ext.getReleaseKeyAlias = { ->
 }
 
 ext.isAndroidStudio = { ->
-    def sysProps = System.getProperties()
-    return sysProps != null && sysProps['idea.platform.prefix'] != null
+    return project.hasProperty('android.injected.invoked.from.ide')
 }
 
 ext.shouldZipAlign = { ->

platform/android/java/build.gradle

@@ -232,11 +232,6 @@ def generateBuildTasks(String flavor = "template") {
     return tasks
 }
 
-def isAndroidStudio() {
-    def sysProps = System.getProperties()
-    return sysProps != null && sysProps['idea.platform.prefix'] != null
-}
-
 task copyEditorReleaseApkToBin(type: Copy) {
     dependsOn ':editor:assembleRelease'
     from('editor/build/outputs/apk/release')