Test randomization for `framework_tests_shard` failing on skia gold

This is a real breakage, but stemming from (I assume) the randomization of test ordering.

Failure build: https://ci.chromium.org/ui/p/flutter/builders/prod/Mac%20framework_tests_impeller/14358/overview

Randomization:
```
RUNNING: cd packages/flutter; ../../bin/flutter test --reporter=expanded --file-reporter=json:/Volumes/Work/s/w/ir/x/t/metrics_1789738816684676.json --test-randomize-ordering-seed=20260918 --fatal-warnings --enable-impeller
```

Golden image: https://flutter-gold.skia.org/detail?grouping=name%3Dcupertino.cupertinoActionSheet.press-drag%26source_type%3Dflutter&digest=1abad162be65fd60cd499b61798396b4