Extend CLI openfn pull command to the allow snapshot id via argument

[christad92]

GitHub actions rely on opening pull to fetch project state and .yaml files from the app to a GitHub repository (as it would when called in a local environment). When this command is called, the latest version of the project (workflows and settings) is fetched and saved in a directory specified in the config.json file.

Whilst this works for most use cases, there's a challenge when openfn pull is triggered by the Sync to GitHub feature on Lightning. This is because there is a lag between when the Sync to GitHub event was triggered and when the GitHub action triggers the openfn pull command. With snapshots, we want to be able to attach a snapshot id to openfn pull so that newer changes are not deployed until the user syncs them by clicking "Sync to GitHub".

[christad92]

Merged with the #729 as a duplicate.