fix: show last deleted message [WPB-1899]

[Garzas]

WPB-1899 Wrong conversation second line when someone deletes the last message

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PR Submission Checklist for internal contributors

• The PR Title

  • [ ] conforms to the style of semantic commits messages¹ supported in Wire's Github Workflow²
  • [ ] contains a reference JIRA issue number like SQPIT-764
  • [ ] answers the question: If merged, this PR will: ... ³

• The PR Description

  • [ ] is free of optional paragraphs and you have filled the relevant parts to the best of your ability

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What's new in this PR?

Issues

All deleted messages were filtered from message previews

Causes (Optional)

Conversations showed last message before deleted message

Solutions

Remove deleted message previews filtering and introduce new Deleted content

Attachments (Optional)

Attachments like images, videos, etc. (drag and drop in the text box)

[AndroidBob]

Build 4708 failed.

[github-actions[bot]]

Test Results

928 tests  +1   928 :white_check_mark: +1   8m 39s :stopwatch: - 6m 21s 123 suites ±0     0 :zzz: ±0  123 files   ±0     0 :x: ±0 

Results for commit 42eeb6ec. ± Comparison against base commit bcee8486.

:recycle: This comment has been updated with latest results.

[AndroidBob]

Build 4710 failed.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 44.31%. Comparing base (bcee848) to head (42eeb6e).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2996      +/-   ##
===========================================
+ Coverage    44.29%   44.31%   +0.02%     
===========================================
  Files          444      444              
  Lines        14488    14492       +4     
  Branches      2492     2493       +1     
===========================================
+ Hits          6417     6422       +5     
+ Misses        7373     7369       -4     
- Partials       698      701       +3     

Files	Coverage Δ
...wire/android/mapper/MessagePreviewContentMapper.kt	57.52% <100.00%> (+1.48%)	:arrow_up:

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[github-actions[bot]]

APKs built during tests are available here. Scroll down to Artifacts!

[AndroidBob]

Build 4721 succeeded.

The build produced the following APK's:

• com.wire.android-v4.8.0(9661446)(9661446)-staging-compat.apk