Close the media preview screen ASAP with sending queue enabled

[jmartinesp]

Content

• When the media file is done processing and we've pressed the 'send' button, just dismiss the attachment preview instead of waiting for the file to be sent.
• For this, get the @SessionCoroutineScope from the SessionMatrixModule and use it to send the media even if the preview screen or the chat room screen are dismissed.
• As soon as the sending process begins in background, dismiss the attachment preview screen.

Motivation and context

We decided to have this behaviour to improve the UX.

Screenshots / GIFs

Screen_recording_20241223_133920.mp4

Tests

• Enable the 'Media upload through send queue' developer option.
• Send a large media file, press the send button quickly.
• There may still be some progress dialog while the thumbnail is being generated and the media is compressed, if enabled.
• As seen in the video above, the preview screen should be dismissed and a local echo of the media file should appear.
• After a few seconds, the media should be marked as sent.

Tested devices

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

Checklist

• Changes have been tested on an Android device or Android emulator with API 23
• 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
• Pull request includes a sign off
• You've made a self review of your PR

[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

All modified and coverable lines are covered by tests ✅

Project coverage is 83.25%. Comparing base (a26a02b) to head (7e3d8b1).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #4089   +/-   ##
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  Coverage    83.25%   83.25%           
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  Files         1881     1881           
  Lines        49008    49008           
  Branches      5747     5747           
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  Hits         40800    40800           
  Misses        6144     6144           
  Partials      2064     2064           

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