[CC-52142] Add tests for data sources and resource import

[erademacher]

Made sure all resources and data sources have tests. Added import steps to resources that didn't already have one.

Commit checklist

• [n/a] Changelog
• [n/a] Doc gen (make generate)
• [x] Integration test(s)
• [x] Acceptance test(s)
• [n/a] Example(s)

[erademacher]

TFTR! I'll make a followup to update the rest of the boilerplate.

[jenngeorge]

also LGTM !