Fix generic mime type used when externally sharing several files

[jmartinesp]

Content

Get the mime type of each uri shared with the app.

Motivation and context

Fixes #4279.

Tests

It's difficult to test without a debugger, having access to the media server or adding some logs.

• From an external app, like a gallery, share images with different formates.
• Check the mime type of each image matches, instead of just a image/* mime type being used.

Tested devices

• Physical
• Emulator
• OS version(s): 14

Checklist

• Changes have been tested on an Android device or Android emulator with API 24
• UI change has been tested on both light and dark themes
• Accessibility has been taken into account. See https://github.com/element-hq/element-x-android/blob/develop/CONTRIBUTING.md#accessibility
• Pull request is based on the develop branch
• Pull request title will be used in the release note, it clearly define what will change for the user
• Pull request includes screenshots or videos if containing UI changes
• You've made a self review of your PR

[bmarty]

Makes sense, thanks!

[github-actions]

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 80.15%. Comparing base (e6b1c19) to head (e315121).
Report is 6 commits behind head on develop.

Files with missing lines	Patch %	Lines
.../android/features/share/impl/ShareIntentHandler.kt	0.00%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #4715      +/-   ##
===========================================
- Coverage    80.16%   80.15%   -0.01%     
===========================================
  Files         2126     2126              
  Lines        56313    56314       +1     
  Branches      7021     7022       +1     
===========================================
  Hits         45141    45141              
- Misses        8761     8762       +1     
  Partials      2411     2411              

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