fix: remove You/null from self deleting notification (WPB-3553)

[github-actions]

Cherry pick from the original PR:

• fix: remove You/null from self deleting notification (WPB-3553) #2096

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⚠️ Conflicts during cherry-pick:

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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

When receiving a self deleting message (either group or 1:1), it would be showing You or null as the senders name instead of Someone

Solutions

When message is self deleting, add Person/sender as Someone as per in the mocks.

Testing

How to Test

• Receive self deleting message in group and 1:1
• Verify sender name is Someone and not You or null

Attachments (Optional)

[codecov]

Codecov Report

Merging #2098 (cd33298) into develop (2000815) will decrease coverage by 0.01%.
The diff coverage is 0.00%.

@@              Coverage Diff              @@
##             develop    #2098      +/-   ##
=============================================
- Coverage      39.63%   39.63%   -0.01%     
  Complexity       939      939              
=============================================
  Files            305      305              
  Lines          11262    11263       +1     
  Branches        1506     1506              
=============================================
  Hits            4464     4464              
- Misses          6369     6370       +1     
  Partials         429      429              

Files Changed	Coverage Δ
...android/notification/MessageNotificationManager.kt	0.00% <0.00%> (ø)

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[github-actions]

Test Results

537 tests  ±0   536 ✔️ ±0   7m 29s ⏱️ + 1m 48s
  79 suites ±0       1 💤 ±0 
  79 files   ±0       0 ❌ ±0 

Results for commit cd33298. ± Comparison against base commit 2000815.

[github-actions]

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

[AndroidBob]

Build 1083 succeeded.

The build produced the following APK's:

• com.wire.android-v4.4.0(7305902)(7305902)-staging-compat.apk