[test/ffi] @Native assets test AOT with --strip

This more closely resembles --release compilation in Flutter on Linux
and Android.

TEST=tests/ffi/native_assets/asset_absolute_test.dart

Bug: #49803
Change-Id: I51ea100966393cd25b11a44dc2c40ce43552ae87
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/283184
Commit-Queue: Daco Harkes <[email protected]>
Reviewed-by: Tess Strickland <[email protected]>

Author: dcharkes

tests/ffi/native_assets/helpers.dart

@@ -165,6 +165,7 @@ Future<void> runGenSnapshot({
       arguments: [
         '--snapshot-kind=app-aot-elf',
         '--elf=${outputUri.toFilePath()}',
+        '--strip',
         dillUri.toFilePath(),
       ],
     );