[9.x] Fix too many channels with pusher broadcasting #42287
Merged
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This PR fixes an issue with the Pusher channel so it sends the events in batches of 100 as Pusher will not allow more than that amount of channels.
I didn't sent this in to 8.x because the pusher implementation is different there and didn't want to introduce merge conflicts.
See https://pusher.com/docs/channels/server_api/http-api/#publishing-events
Fixes #42269