Revert "Add support for exporting to Google Play Instant"

This reverts commit 12ad9ed4e0.

Shortly after the feature was merged, we received news that Google will shut down Instant Apps in December 2025. Since this feature is being discontinued soon, there’s no value in keeping it for just a few months.

platform/android/java/app/build.gradle

@@ -37,10 +37,6 @@ dependencies {
     implementation "androidx.fragment:fragment:$versions.fragmentVersion"
     implementation "androidx.core:core-splashscreen:$versions.splashscreenVersion"
 
-    if (isInstantApp()) {
-        implementation "com.google.android.gms:play-services-instantapps:$versions.instantAppsVersion"
-    }
-
     if (rootProject.findProject(":lib")) {
         implementation project(":lib")
     } else if (rootProject.findProject(":godot:lib")) {
@@ -94,7 +90,7 @@ android {
         jvmTarget = versions.javaVersion
     }
 
-    assetPacks = isInstantApp() ? [] : [":assetPackInstallTime"]
+    assetPacks = [":assetPackInstallTime"]
 
     namespace = 'com.godot.game'
 

platform/android/java/app/config.gradle

@@ -15,8 +15,7 @@ ext.versions = [
     // Also update 'platform/android/detect.py#get_ndk_version()' when this is updated.
     ndkVersion         : '28.1.13356709',
     splashscreenVersion: '1.0.1',
-    openxrVendorsVersion: '4.0.0-stable',
-    instantAppsVersion: '17.0.0'
+    openxrVendorsVersion: '4.0.0-stable'
 
 ]
 
@@ -380,8 +379,3 @@ ext.getAddonsDirectory = { ->
     String addonsDirectory = project.hasProperty("addons_directory") ? project.property("addons_directory") : ""
     return addonsDirectory
 }
-
-ext.isInstantApp = { ->
-    String instantApp = project.hasProperty("play_instant_app") ? project.property("play_instant_app") : ""
-    return Boolean.parseBoolean(instantApp)
-}