[CI] Turn on Android testing

Author: finagolfin

.github/workflows/pull_request.yml

@@ -26,6 +26,8 @@ jobs:
     uses: swiftlang/github-workflows/.github/workflows/swift_package_test.yml@main
     with:
       enable_wasm_sdk_build: true
+      enable_android_sdk_build: true
+      enable_android_sdk_checks: true
 
   soundness:
     name: Soundness