Import marketplace connection data from a JSON file previously exported.
This endpoint accepts the exported JSON file as a multipart/form-data upload.

Import Process:

• Uploads and validates the JSON file structure
• Creates or updates the connection based on name matching
• Generates new IDs for requests and sessions to avoid conflicts
• Maps connection relationships in imported requests and sessions
• Assigns to the specified tenant and cobrand
• Creates audit trail entries for imported items
• Handles cross-environment imports with brand code mapping

Important Notes:

• Connection is matched by name; if exists, it will be updated
• Requests and sessions are always created as new entities
• Sensitive data like client secrets are regenerated for security
• Import supports cross-environment scenarios with brand code mapping
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