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

.gitignore

@@ -74,10 +74,10 @@ unlinked_spec.ds
 **/android/captures/
 **/android/gradlew
 **/android/gradlew.bat
-**/android/local.properties
 **/android/**/GeneratedPluginRegistrant.java
 **/android/key.properties
 *.jks
+local.properties
 
 # iOS/XCode related
 **/ios/**/*.mode1v3