[SPE-2836] Terraform generation should preferentially work with application/json content types

[ThomasRooney]

Given a request or response body with multiple content types, we should preferentially assume that the operation is working with application/json. Currently we produce an error.

failed to generate output -- failed to run script Error: Duplicate x-speakeasy-entity-operation: Pet#create in addPet_json and undefined
    at ./resources.ts:764:20:*(27)                                                                                                      
    at sort (native)                                                                                                                    
    at ./resources.ts:762:16:*(409)                                                                                                     
    at forEach (native)                                                                                                                 
    at collectResources (./resources.ts:587:29:*(101))                                                                                  
    at main.ts:23:52:*(94)                                                                                                              
: script runtime failure                                                                                                                
failed to generate SDKs for terraform ✖

api.yaml.zip

_SPE-2836