Pass single service_provider to sync

[Sgtpluck]

Relevant Ticket or Conversation:

https://cm-jira.usa.gov/browse/LG-10062

Description of Changes:

This change updates the service_provider save code flow so that a single service provider is sent to the IDP to be synced in the sandbox, creating a much faster "publish."

This change has a corresponding PR in the IDP that should be merged in first.

PR Checklist:

1. Have you linted and tested your code locally prior to submission?
2. Have you tagged the appropriate dev(s) for review?
3. Have you linked to any relevant tickets or conversations?

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