test: no longer look for `type` in cmap spec test runner
test: no longer look for `type` in cmap spec test runner

The CMAP spec test runner was assuming a particular shape of error
reported, which included a `type` field which is only useful for
testing. In order to preserve an order that would actually be
useful for users, we only compare error messages now.

mongodb/node-mongodb-native,mongodb/node-mongodb-native,mongodb/node-mongodb-native,mongodb/node-mongodb-native