Fixes and refactoring to discord changelog script #33859
+125
−90
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Upstreamed from impstation#1023
This rewrites the script used to send new changelog entries to a discord webhook. There was a comment in the script noting that it wasn't robust on very long individual changelog entires. We ran into that on our fork so I fixed it to handle arbitrarily long messages and arbitrarily long change groups. Also tidy it up a bit and use isort and black