Upgrade Hilt Gradle Plugin min AGP version to 8.1

This change upgrades the required AGP in the Hilt Gradle Plugin and in turn cleans up the code no longer relevant due to the upgrade. [As of September 2024 the target SDK for apps in the play store is 34](https://developer.android.com/google/play/requirements/target-sdk) and the [minimum AGP that supports target SDK 34 is 8.1.1](https://developer.android.com/build/releases/gradle-plugin#api-level-support) hence why such version chosen.

* Remove the AGP abstraction an implementations from the plugin, we can now use Variant Component and ASM Transform APIs directly.
* AGP 8.1 requires Gradle 8.0 which in turns requires JDK 17, used jvmToolchain API where possible.
* AGP 8.1 requires minimum Android build tools of 33.0.1.
* AGP 8.1 requires Android projects to have their 'namespace' set.
* Update GitHub CI test matrix, removing older AGP values.

RELNOTES=Upgrade Hilt Gradle Plugin min AGP version to 8.1
PiperOrigin-RevId: 681507589

.github/actions/artifact-android-local-tests/action.yml

@@ -7,9 +7,7 @@ inputs:
     required: true
     type: choice
     options:
-      - '7.0.0'
-      - '7.1.2'
-      - '8.1.0'
+      - '8.1.1'
   jdk:
     description: 'The version of JDK to test with.'
     required: true

.github/workflows/ci.yml

@@ -11,7 +11,7 @@ on:
 env:
   USE_JAVA_DISTRIBUTION: 'zulu'
   USE_JAVA_VERSION: '11'
-  # This is required by AGP 8.3+.
+  # This is required by Gradle 8.0+.
   USE_JAVA_VERSION_FOR_PLUGIN: '17'
   # The default Maven 3.9.0 has a regression so we manually install 3.8.7.
   # https://issues.apache.org/jira/browse/MNG-7679
@@ -68,11 +68,7 @@ jobs:
     strategy:
       matrix:
         include:
-          - agp: '7.0.0'
-            jdk: '11'
-          - agp: '7.1.2'
-            jdk: '11'
-          - agp: '8.1.0'
+          - agp: '8.1.1'
             jdk: '17'
     steps:
       - uses: actions/checkout@v3

.github/workflows/release.yml

@@ -10,7 +10,7 @@ on:
 env:
   USE_JAVA_DISTRIBUTION: 'zulu'
   USE_JAVA_VERSION: '11'
-  # This is required by AGP 8.3+.
+  # This is required by Gradle 8.0+.
   USE_JAVA_VERSION_FOR_PLUGIN: '17'
   DAGGER_RELEASE_VERSION: "${{ github.event.inputs.dagger_release_version }}"
   # The default Maven 3.9.0 has a regression so we manually install 3.8.7.
@@ -70,11 +70,7 @@ jobs:
     strategy:
       matrix:
         include:
-          - agp: '7.0.0'
-            jdk: '11'
-          - agp: '7.1.2'
-            jdk: '11'
-          - agp: '8.1.0'
+          - agp: '8.1.1'
             jdk: '17'
     steps:
       - uses: actions/checkout@v3