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gzip skymap before adding to alert notices being sent to GCN Kafka

Cody Messick requested to merge cody.messick/gwcelery:gzip_gcn_kafka_notices into main

The base64 encoded skymaps are making the alerts we send to GCN kafka too large for the default kafka payload limit (1MB, which I assume GCN is using). We don't see this with the avro alerts because the not-base64 encoded skymaps are smaller.

This MR gzips the skymap before base64 encoding it and decoding it to utf-8.

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