Reverts "Upgrade template Gradle, App AGP, Module AGP, and Kotlin versions, and tests (#150969)" (#151147)

Reverts: flutter/flutter#150969
Initiated by: goderbauer
Reason for reverting: Failing test in https://logs.chromium.org/logs/flutter/buildbucket/cr-buildbucket/8743574743030691569/+/u/run_android_obfuscate_test/stdout
Original PR Author: gmackall

Reviewed By: {christopherfujino, reidbaker}

This change reverts the following previous change:
After the land of https://github.com/flutter/engine/pull/53592, there is some log spam:
```
e: /Users/mackall/.gradle/caches/transforms-3/c1e137371ec1afe9bc9bd7b05823752d/transformed/fragment-1.7.1/jars/classes.jar!/META-INF/fragment_release.kotlin_module: Module was compiled with an incompatible version of Kotlin. The binary version of its metadata is 1.8.0, expected version is 1.6.0.
e: /Users/mackall/.gradle/caches/transforms-3/d86c7cb1c556fe1655fa56db671c649c/transformed/jetified-activity-1.8.1/jars/classes.jar!/META-INF/activity_release.kotlin_module: Module was compiled with an incompatible version of Kotlin. The binary version of its metadata is 1.8.0, expected version is 1.6.0.
...
```

I think this is harmless, but still annoying. Upgrading the AGP version fixes it. To be honest, I don't know why (I expected the Kotlin version would do it). But after https://github.com/flutter/flutter/pull/146307, our tests have been running on AGP/Gradle 8.1/8.3 for a while, so it makes sense to upgrade anyways.

In a follow up PR:
1. Also upgrade the tests that were left behind in https://github.com/flutter/flutter/pull/146307, as I think removal of discontinued plugins paved the way here.

.ci.yaml

@@ -1155,35 +1155,9 @@ targets:
           {"dependency": "cmake", "version": "build_id:8787856497187628321"},
           {"dependency": "goldctl", "version": "git_revision:720a542f6fe4f92922c3b8f0fdcc4d2ac6bb83cd"},
           {"dependency": "ninja", "version": "version:1.9.0"},
-          {"dependency": "open_jdk", "version": "version:17"}
-        ]
-      shard: android_preview_tool_integration_tests
-      tags: >
-        ["framework", "hostonly", "shard", "linux"]
-      test_timeout_secs: "2700"
-    runIf:
-      - dev/**
-      - packages/flutter_tools/**
-      - bin/**
-      - .ci.yaml
-
-  - name: Linux android_java11_tool_integration_tests
-    recipe: flutter/flutter_drone
-    bringup: true
-    timeout: 60
-    properties:
-      add_recipes_cq: "true"
-      dependencies: >-
-        [
-          {"dependency": "android_sdk", "version": "version:34v3"},
-          {"dependency": "chrome_and_driver", "version": "version:125.0.6422.141"},
-          {"dependency": "clang", "version": "git_revision:5d5aba78dbbee75508f01bcaa69aedb2ab79065a"},
-          {"dependency": "cmake", "version": "build_id:8787856497187628321"},
-          {"dependency": "goldctl", "version": "git_revision:720a542f6fe4f92922c3b8f0fdcc4d2ac6bb83cd"},
-          {"dependency": "ninja", "version": "version:1.9.0"},
           {"dependency": "open_jdk", "version": "version:11"}
         ]
-      shard: android_java11_tool_integration_tests
+      shard: android_preview_tool_integration_tests
       tags: >
         ["framework", "hostonly", "shard", "linux"]
       test_timeout_secs: "2700"