chore: fix sample app Android build on Flutter 3.44.5

[mrehan27]

Summary

The sample apps' Android build broke when CI's Flutter stable channel auto-updated 3.44.4 → 3.44.5:

> Could not create task ':app:copyJniLibsflutterBuildDebug'.
   > Task with name 'compileFlutterBuildDebug' not found in project ':app'.

Root cause

Flutter 3.44.5's Gradle plugin creates copyJniLibs<variant> through the new AGP variant API and looks up the compileFlutterBuild<variant> task that the legacy applicationVariants callback registers. Both sample apps' app/build.gradle used the eager tasks.whenTaskAdded { } API, which forced copyJniLibs… to realize during configuration — before that compile task existed — so task creation failed.

This is purely a toolchain incompatibility, not a dependency or SDK issue: it reproduces on a clean main checkout with 3.44.5, and fails before any CustomerIO dependency resolution.

Fix

Replace the deprecated eager whenTaskAdded with the lazy tasks.matching { }.configureEach { } API (the recommended replacement), so the compressReleaseAssets → copyFlutterAssetsRelease dependency is wired without forcing early task realization.

-    tasks.whenTaskAdded { task ->
-        if (task.name == 'compressReleaseAssets') {
-            task.dependsOn 'copyFlutterAssetsRelease'
-        }
-    }
+    tasks.matching { it.name == 'compressReleaseAssets' }.configureEach {
+        dependsOn 'copyFlutterAssetsRelease'
+    }

Applied to both sample apps (flutter_sample_spm + flutter_sample_cocoapods).

Also commits the android.builtInKotlin=false / android.newDsl=false flags that Flutter 3.44.5's migrator writes to each app's gradle.properties on every build — committing them keeps the working tree clean instead of regenerating (and dirtying) on each build. They opt out of the new Kotlin/DSL migration for now (behavior unchanged); the full migration is part of the toolchain-bump follow-up below.

Verified locally (Flutter 3.44.5)

• flutter_sample_spm: clean flutter clean + flutter build apk --debug → ✅
• flutter_sample_cocoapods: clean build → ✅

Notes

• Not related to the geofence work — this is a general sample-app toolchain fix, hence targeting main (to be back-merged into feature/geofence-on-device).
• Out of scope / follow-up: Flutter 3.44.5 also warns that Gradle 8.11.1, AGP 8.9.3, and Kotlin 2.1.21 "will soon be dropped." Those are non-blocking deprecation warnings (build is green); the version bumps carry their own risk and will be handled in a separate PR.

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Note

Low Risk
Sample-app-only Gradle configuration changes with no product SDK or auth/data impact; behavior of the asset task dependency is preserved.

Overview
Restores Android builds for the flutter_sample_spm and flutter_sample_cocoapods sample apps after Flutter 3.44.5 broke configuration with compileFlutterBuildDebug / copyJniLibs task ordering.

In each app's app/build.gradle, the eager tasks.whenTaskAdded hook for compressReleaseAssets → copyFlutterAssetsRelease is replaced with tasks.matching { }.configureEach, so that dependency is applied lazily and Gradle no longer realizes Flutter JNI tasks too early during configuration.

Each sample's gradle.properties now commits android.builtInKotlin=false and android.newDsl=false from the Flutter migrator so local builds stay clean without changing runtime behavior.

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[github-actions]

Sample app builds 📱

Below you will find the list of the latest versions of the sample apps. It's recommended to always download the latest builds of the sample apps to accurately test the pull request.

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• flutter_sample_spm: 363.1.0 (29724068)