Fix add_to_app sample (#2768)

The android_view add_to_app sample is currently broken.  It does not build:

* AGP version is incompatible.
* MIN_SDK is below Flutter min
* Flutter plugin module was renamed awhile ago: https://github.com/flutter/samples/pull/2714

add_to_app/android_view/android_view/app/build.gradle

@@ -12,7 +12,7 @@ android {
 
     defaultConfig {
         applicationId "dev.flutter.example.androidView"
-        minSdkVersion 21
+        minSdkVersion 24
         targetSdk 36
         versionCode 1
         versionName "1.0"
@@ -55,4 +55,4 @@ dependencies {
     testImplementation 'junit:junit:4.+'
     androidTestImplementation 'androidx.test.ext:junit:1.2.1'
     androidTestImplementation 'androidx.test.espresso:espresso-core:3.6.1'
-}
+}

add_to_app/android_view/android_view/build.gradle

@@ -6,7 +6,7 @@ buildscript {
         mavenCentral()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:8.9.0'
+        classpath 'com.android.tools.build:gradle:8.9.1'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
 
         // NOTE: Do not place your application dependencies here; they belong
@@ -23,4 +23,4 @@ allprojects {
 
 tasks.register('clean', Delete) {
     delete rootProject.buildDir
-}
+}

add_to_app/android_view/android_view/settings.gradle

@@ -3,5 +3,5 @@ include ':app'
 setBinding(new Binding([gradle: this]))
 evaluate(new File(
   settingsDir.parentFile,
-  'flutter_module_using_plugin/.android/include_flutter.groovy'
+  'flutter_module_using_plugin_android_view/.android/include_flutter.groovy'
 ))