Add snapshots to the url for fetching project spec

[midigofrank]

Short Description

This is a follow up to #732
The cli makes 2 API requests when you run openfn pull {projectID} .

This PR adds the provided snapshot ids to the URL for fetching the project spec

Related issue

Fixes #729

Implementation Details

• I'm a little worried that the logic for building the query params has been duplicated. At the same time, I think it's okay to duplicate it because they are 2 different endpoints and they "could" require different logic.

Checklist before requesting a review

• I have performed a self-review of my code
• I have added unit tests
• Changesets have been added (if there are production code changes)

[josephjclark]

I'd probably call this a patch actually @midigofrank - it doesn't change the external API. Let's treat it as a fix to the previous.

I'll go ahead and do this now