[iOS] Delete unused create_ios_framework.py (flutter#54227)

This script is unused and is superseded by create_full_ios_framework.py.

[C++, Objective-C, Java style guides]: https://github.com/flutter/engine/blob/main/CONTRIBUTING.md#style

Author: cbracken

ci/licenses_golden/excluded_files

@@ -432,7 +432,6 @@
 ../../../flutter/sky/packages/sky_engine/pubspec.yaml
 ../../../flutter/sky/tools/create_embedder_framework.py
 ../../../flutter/sky/tools/create_full_ios_framework.py
-../../../flutter/sky/tools/create_ios_framework.py
 ../../../flutter/sky/tools/create_macos_binary.py
 ../../../flutter/sky/tools/create_macos_framework.py
 ../../../flutter/sky/tools/create_macos_gen_snapshots.py