fix(deploy): reject nango.yaml deploys and remove dead legacy compile code

[hassan254-prog]

Describe the problem and your solution

• reject nango.yaml deploys and remove dead legacy compile code, this should not be deployed before September 15 as that is the sunset date.

[cubic-dev-ai]

No issues found across 8 files

Confidence score: 5/5

• Automated review surfaced no issues in the provided summaries.
• No files require special attention.

_{Re-trigger cubic}