Add additional error logs from the root failure

[wesbillman]

when we fail to extract a schema decl (e.g. typealias, data, etc.) we propagate errors for any corresponding schema references (i.e. anywhere in the schema we find foo.Failed etc.). this produces errors like "unsupported request/response type" on referencing verbs

We should make it clear that the errors are all related, and highlight the "root" one

//ftl:typealias
type MyCoolRequest struct {
	Params  MyCoolParams
}

[alecthomas]

🦠