Fix voicebroadcast playback slider on seek

[nimau]

Fixes #7252

This PR resolves the following issues on the Voice Broadcast audio player:

• the progress bar did not behave as expected after a seek.
• the progress bar did not always reach the end after the playback was finished.
• the displayLink was not paused when stopping or pausing the audio player.

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
No Duplication information

[yostyle]

LGTM

[codecov]

Codecov Report

Base: 11.92% // Head: 11.92% // Decreases project coverage by -0.01% ⚠️

Coverage data is based on head (f685d6f) compared to base (a9ff128).
Patch coverage: 0.00% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #7277      +/-   ##
===========================================
- Coverage    11.92%   11.92%   -0.01%     
===========================================
  Files         1633     1633              
  Lines       160744   160758      +14     
  Branches     65700    65707       +7     
===========================================
  Hits         19163    19163              
- Misses      140942   140956      +14     
  Partials       639      639              

Flag	Coverage Δ
uitests	55.23% <ø> (ø)
unittests	5.96% <0.00%> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...ck/MatrixSDK/VoiceBroadcastPlaybackViewModel.swift	0.00% <0.00%> (ø)

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