service:push to wait for server response

For reference: (see `sleep 5`)
https://www.apollographql.com/docs/platform/schema-registry.html#history

We should consider adding default or flag-based functionality to the `service:push` command to allow it to wait or make multiple attempts until it gets a successful response from the server.

`--wait`?
`--noWait` to opt out if waiting should be default?

Start by locating the `service:push` command and reading how it currently handles the schema registry server response. Compare the requested wait and retry behavior with the linked schema registry history documentation, then define the default and flag semantics and how successful completion should be verified.

Written by the indexing model from the issue text.