Add voice broadcast seek 30s forward/backward buttons

[weeman1337]

Part of element-hq/element-web#23282

PSF-1587

Checklist

• Tests written for new code (and old code if feasible)
• Linter and other CI checks pass
• Sign-off given on the changes (see CONTRIBUTING.md)

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This change is marked as an internal change (Task), so will not be included in the changelog.

[turt2live]

I'm a bit surprised to see voice broadcast in its own tree as well - we likely aren't applying the correct CI checks to the tree. It should be merged into the existing src/components structure (in another PR).

[turt2live]

This implies an unexpected change?

[weeman1337]

No, this is expected. I've added another test to explicitly look for the time update.

https://github.com/matrix-org/matrix-react-sdk/pull/9592/files#diff-6e97d35a4cfa5d17d4be2ea0e889b83b6081db3fbd23c7cc07333324837b14e8R135

comes from here

https://github.com/matrix-org/matrix-react-sdk/pull/9592/files#diff-6e97d35a4cfa5d17d4be2ea0e889b83b6081db3fbd23c7cc07333324837b14e8L107

[weeman1337]

I'm a bit surprised to see voice broadcast in its own tree as well

As far as I remember we wanted to keep voice broadcast separated from the rest for now.

we likely aren't applying the correct CI checks to the tree

Are there any checks not running or running differently for that part?

[turt2live]

Are there any checks not running or running differently for that part?

I believe there's some checks which only run in src/components, but I may be mistaken (or they were removed). Either way, would be good to put the code into the rest of the tree, even if it is "temporary".