Implement MSC3987: Push actions clean-up

[nimau]

This PR implements the change requested by #7576 by adding support for MSC3987 which deprecates the dont_notify action for a push_rule.

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
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No Coverage information
No Duplication information

[stefanceriu]

👍

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.15 ⚠️

Comparison is base (3e30eaf) 12.36% compared to head (12159cc) 12.21%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #7585      +/-   ##
===========================================
- Coverage    12.36%   12.21%   -0.15%     
===========================================
  Files         1648     1648              
  Lines       163634   163663      +29     
  Branches     67192    67195       +3     
===========================================
- Hits         20232    19992     -240     
- Misses      142737   143026     +289     
+ Partials       665      645      -20     

Flag	Coverage Δ
uitests	55.05% <ø> (ø)
unittests	6.06% <0.00%> (-0.15%)	⬇️

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Impacted Files	Coverage Δ
Riot/Categories/MXRoom+Riot.m	0.00% <0.00%> (ø)
.../MatrixSDK/MXRoomNotificationSettingsService.swift	0.00% <0.00%> (ø)
...tions/Model/MatrixSDK/MXNotificationPushRule.swift	0.00% <0.00%> (ø)

... and 15 files with indirect coverage changes

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