update saas connectors to estuary-cdk

[jgraettinger]

• Update all forked airbyte connectors to use the estuary-cdk and it's airbyte shim.
• Clean them up into a new, canonical layout for these connectors.
• Get their tests passing -- which required fixes in some cases.

Workflow steps:

(How does one use this feature, and how has it changed)

Documentation links affected:

(list any documentation links that you created, or existing ones that you've identified as needing updates, along with a brief description)

Notes for reviewers:

(anything that might help someone review this PR)

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This change is 

[jgraettinger]

@jshearer bump?

[jshearer]

Took a look over the changes, looks good to me! AFAICT the source of the connectors themselves didn't change, and this was just moving them around/getting the original connector tests running/passing.