[Facebook Custom Audiences] - correct error type

[joe-ayoub-segment]

Main build broken as error type incorrect in fbca destination - causing unit tests to fail.

Testing

None required.

Security Review

Please ensure sensitive data is properly protected in your integration.

• Reviewed all field definitions for sensitive data (API keys, tokens, passwords, client secrets) and confirmed they use type: 'password'

New Destination Checklist

• Extracted all action API versions to verioning-info.ts file. example

[Copilot]

Pull request overview

This PR fixes the error code returned by the Facebook Custom Audiences sync implementation when early validation fails, aligning runtime behavior with the destination’s expected MultiStatus error typing and unblocking failing unit tests.

Changes:

• Update the validation failure path in send() to return ErrorCodes.INVALID_AUDIENCE_MEMBERSHIP instead of ErrorCodes.PAYLOAD_VALIDATION_FAILED.