fix: delete leftover heartbeat connections#1033

df-wg merged 8 commits intomasterwundergraph/graphql-go-tools:masterfrom

dave/eng-6234-multipart-write-error-when-router-loses-its-connection-withwundergraph/graphql-go-tools:dave/eng-6234-multipart-write-error-when-router-loses-its-connection-withCopy head branch name to clipboard