Remove replace directives and use own fork to make go get work again (#1028)

See https://github.com/golang/go/issues/30354
go get doesn't honor the go.mod replace options.

vendor/github.com/matterbridge/msgraph.go/beta/ChatMessageHostedContentModel.go

@@ -0,0 +1,9 @@
+// Code generated by msgraph-generate.go DO NOT EDIT.
+
+package msgraph
+
+// ChatMessageHostedContent undocumented
+type ChatMessageHostedContent struct {
+	// Entity is the base model of ChatMessageHostedContent
+	Entity
+}