engine/schedulemanager: fix sending messages to multiple Slack channels at the same time #1879
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Description:
Fixes an issue where multiple on-call notifications would fail to send at the same time (for separate channels).
Additional Info:
When collecting the messages to be sent we were tracking them so that a schedule ID mapped to a single channel ID. Now they are stored as a slice of channel IDs -- with care taken to ensure we don't send duplicate messages to the same channel.