update module_host_with_custom_build_v2_embedding to target android 35 and to use the latest gradle and agp versions (#163542)

Part of #149836 

## Pre-launch Checklist

- [x] I read the [Contributor Guide] and followed the process outlined
there for submitting PRs.
- [x] I read the [Tree Hygiene] wiki page, which explains my
responsibilities.
- [x] I read and followed the [Flutter Style Guide], including [Features
we expect every widget to implement].
- [x] I signed the [CLA].
- [x] I listed at least one issue that this PR fixes in the description
above.
- [x] I updated/added relevant documentation (doc comments with `///`).
- [x] I added new tests to check the change I am making, or this PR is
[test-exempt].
- [x] I followed the [breaking change policy] and added [Data Driven
Fixes] where supported.
- [x] All existing and new tests are passing.

dev/integration_tests/module_host_with_custom_build_v2_embedding/app/build.gradle

@@ -6,7 +6,7 @@ apply plugin: 'com.android.application'
 
 android {
     namespace = "io.flutter.addtoapp"
-    compileSdk 34
+    compileSdk 35
 
     // Flutter's CI installs the NDK at a non-standard path.
     // This non-standard structure is initially created by
@@ -25,7 +25,7 @@ android {
     defaultConfig {
         applicationId "io.flutter.addtoapp"
         minSdkVersion 21
-        targetSdkVersion 34
+        targetSdkVersion 35
         versionCode 1
         versionName "1.0"
     }
@@ -36,15 +36,15 @@ android {
             // This is required because the `:flutter` project doesn't define this custom build type.
             // Without the fallback, the Android plugin will make Gradle exit with the following error:
             // `Unable to find a matching variant of project :flutter`
-            matchingFallbacks = ['debug']
+            matchingFallbacks += 'debug'
         }
         prod {
             initWith release
-            matchingFallbacks = ['release']
+            matchingFallbacks += 'release'
         }
     }
     // Test flavors.
-    flavorDimensions "version"
+    flavorDimensions += "version"
     productFlavors {
         demo {
             dimension "version"

dev/integration_tests/module_host_with_custom_build_v2_embedding/build.gradle

@@ -8,7 +8,7 @@ buildscript {
         mavenCentral()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:8.1.0'
+        classpath 'com.android.tools.build:gradle:8.8.1'
     }
 }
 

dev/integration_tests/module_host_with_custom_build_v2_embedding/gradle/wrapper/gradle-wrapper.properties

@@ -1,5 +1,7 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.12.1-bin.zip
+networkTimeout=10000
+validateDistributionUrl=true
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.4-all.zip