Voice Broadcast - Fix duplicated chunks in the internal playlist during live broadcasts

[Florian14]

Type of change

• Feature
• Bugfix
• Technical
• Other :

Content

Sometimes the playlist of voice messages contains duplicated sequences, this PR adds a distinct filter on the sequence number when fetching the playlist to prevent this case.

Motivation and context

Fix a bug when listening to a live voice broadcast, not sure it can perturb the listening.

Screenshots / GIFs

Tests

Tested by debugging a live broadcast where I observed an issue on the computed duration in #7494

Tested devices

• Physical
• Emulator
• OS version(s):

Checklist

• Changes has been tested on an Android device or Android emulator with API 21
• UI change has been tested on both light and dark themes
• Accessibility has been taken into account. See https://github.com/vector-im/element-android/blob/develop/CONTRIBUTING.md#accessibility
• Pull request is based on the resilience branch
• Pull request includes a new file under ./changelog.d. See https://github.com/vector-im/element-android/blob/develop/CONTRIBUTING.md#changelog
• Pull request includes screenshots or videos if containing UI changes
• Pull request includes a sign off
• You've made a self review of your PR
• If you have modified the screen flow, or added new screens to the application, you have updated the test UiAllScreensSanityTest.allScreensTest()

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

0.0% Coverage
0.0% Duplication

[mnaturel]

LGTM.