fix: use mimeType for the expo image picker response

[bang9]

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Description Of Changes

Property	Type	Description
mimeType(optional)	string	The MIME type of the selected asset or null if could not be determined.
type(optional)	'image' | 'video' | 'livePhoto' | 'pairedVideo'	The type of the asset.'image' - for images.'video' - for videos.'livePhoto' - for live photos. (iOS only)'pairedVideo' - for videos paired with photos, which can be combined to create a live photo. (iOS only)

Types Of Changes

What types of changes does your code introduce to this project?
Put an x in the boxes that apply_

• Bugfix
• New feature
• Documentation (correction or otherwise)
• Cosmetics (whitespace, appearance (ex) Prettier)
• Build configuration
• Improvement (refactor code)
• Test

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 10.85%. Comparing base (91cf10f) to head (7430393).

Files with missing lines	Patch %	Lines
.../uikit-react-native/src/utils/expoBackwardUtils.ts	0.00%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #282   +/-   ##
=======================================
  Coverage   10.85%   10.85%           
=======================================
  Files         360      360           
  Lines        9049     9049           
  Branches     2574     2557   -17     
=======================================
  Hits          982      982           
  Misses       7991     7991           
  Partials       76       76           

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[OnestarLee]

lgtm!