pure_android_host_apps android versions update (#163617)

- **update pure_android_host_apps/android_custom_host_app to
compileSdk/targetSdk 35, newest stable agp and gradle versions, update
source compatibility to java 17, updated dependencies**
- **Update documentation and migrate compileSdkVersion to compileSdk**
- **Update gitignore to ignore specific module folder name and
local.properties repo wide**

Related to #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.

[Discord]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Chat.md
[Data Driven Fixes]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Data-driven-Fixes.md

dev/devicelab/bin/tasks/module_custom_host_app_name_test.dart

@@ -242,6 +242,7 @@ Future<void> main() async {
         'intermediates',
         'assets',
         'debug',
+        'mergeDebugAssets',
         'flutter_assets',
         'assets',
         'read-only.txt',
@@ -315,6 +316,7 @@ Future<void> main() async {
         'intermediates',
         'assets',
         'release',
+        'mergeReleaseAssets',
         'flutter_assets',
         'assets',
         'read-only.txt',