Ignore the voice broadcast chunks at the notifications level

[giomfo]

Your use case

What would you like to do?

During the notifications handling, we should notify only the first voice chunk of a voice broadcast, and ignore the other events related to the voice broadcast chunks

Why would you like to do it?

These events are not displayed in the room timeline, they should not be taken into account in the notifications count.
They are voice messages marked as voice broadcast chunks (they refer to a voice message state event)

There is no case where the user may want to be notified on these chunks, they are supposed to be invisible for them. That is why we can hardcode this mechanism client side without adding config in push rules

How would you like to achieve it?

We have to ignore them locally, because these events are encrypted, we could not ignore them server side

Have you considered any alternatives?

No response

Additional context

No response

Are you willing to provide a PR?

Yes

[giomfo]

related to element-hq/element-ios#7208