[image_picker] Fix android-16 not picking up file

[ashutosh2014]

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Fixes flutter/flutter#182071

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[gemini-code-assist]

Code Review

This pull request addresses an issue on Android 16 (API 36) where the image picker would not return a file path. The solution is to enforce the use of the Android Photo Picker on API 36 and higher, which is implemented via a new utility method, effectiveUsePhotoPicker. This logic is consistently applied throughout the ImagePickerDelegate. The change is also accompanied by new unit tests, which is great. My review includes a minor suggestion to simplify the logic in the new utility method for improved conciseness.