fix: remove label instance image resolution

[agirot]

We don't need anymore the replacement of image label to marketplace UUID.

• Instance can now take a image label and translate it into a compatible UUID
• The actual resolution don't return a compatible image with SBS and return the following error: scaleway-sdk-go: http error 400 Bad Request: cannot create a volume of type sbs_volume from a base of type unified on instance creation

[Codelax]

Tests must be recorded as this currently run on saved requests.
I tried to run tests locally, removing local label resolution is heavily breaking.
With the following code:

serverRes, err := api.CreateServer(&instance.CreateServerRequest{
		CommercialType: "DEV1-M",
		Image:          "ubuntu_jammy",
	})
	if err != nil {
		log.Fatalln(err)
	}

Despite creating a server with a local volume based commercial type, the created server will have a SBS volume per default as the image selected by the API is on SBS.
If next requests use instance API to interact with volumes, it will fail.

[agirot]

Why "hack" the new default volume type of the instance API (switching to SBS volumes) and maintain a specific behavior for the GO SDK?
If you want to keep your local storage with the image label, just add a local volume in your example request.

(only DEV/GP support local volume)