fix: Fixed print of diag errors

[amanenk]

Summary

fixed print of provider configuration error when error is in diags.

---

Use the following steps to ensure your PR is ready to be reviewed

• [x] Read the contribution guidelines 🧑‍🎓
• [x] Run go fmt to format your code 🖊
• [x] Lint your changes via golangci-lint run 🚨 (install golangci-lint here)
• [x] Update or add tests 🧪
• [ ] Ensure the status checks below are successful ✅

[yevgenypats]

We are going to remove diags. so let's hold with any code that touches it atm. there are a lot of bugs related to that but they will partially go away with https://github.com/cloudquery/cq-provider-sdk/pull/437