[v4] Limit available response protocols based on operation type

[n1ru4l]

Is your feature request related to a problem? Please describe.

graphql-yoga/packages/graphql-yoga/src/plugins/useResultProcessor.ts

Lines 44 to 45 in d6b3537

	const defaultList = [sse, multipart, regular]
	const subscriptionList = [multipart, sse, regular]

I have the feeling that we are a bit too loose here.

Describe the solution you'd like

If you are executing a subscription operation, the list should be:

const subscriptionList = [sse] 

And for non-subscription operations, it should probably be

const defaultList = [multipart, regular] 

Describe alternatives you've considered

Additional context

• fix: prefer multipart/mixed content-type for defer/stream operations #2676