Remove a notification if its event has been redacted.

[pixlwave]

iOS equivalent of element-hq/element-x-android#3320

We can't mutate existing notifications on iOS so we simply remove it instead.

[github-actions]

	Warnings
⚠️	Some of the commits are missing ticket numbers. Please consider squashing all commits that don't have a tracking number.

Generated by 🚫 Danger Swift against f84c596

[sonarcloud]

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 SonarCloud

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 45 lines in your changes missing coverage. Please review.

Project coverage is 77.63%. Comparing base (304070e) to head (f84c596).
Report is 2 commits behind head on develop.

Files	Patch %	Lines
NSE/Sources/NotificationServiceExtension.swift	0.00%	30 Missing ⚠️
...urces/Other/Extensions/UNNotificationContent.swift	0.00%	9 Missing ⚠️
NSE/Sources/NotificationContentBuilder.swift	0.00%	4 Missing ⚠️
NSE/Sources/Other/UNNotificationRequest.swift	0.00%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #3191      +/-   ##
===========================================
- Coverage    77.68%   77.63%   -0.06%     
===========================================
  Files          718      718              
  Lines        56655    56692      +37     
===========================================
  Hits         44014    44014              
- Misses       12641    12678      +37     

Flag	Coverage Δ
unittests	68.31% <0.00%> (-0.01%)	⬇️

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