Fix global overrides for any/interface ref types

[ezequiel]

Closes #1834

Description

When overriding with any or interface{}, the code should prefer the "any" (empty) schema instead, not the object schema since that's different e.g.

.swaggo

replace json.RawMessage any

model.go

type Thing struct {
	data json.RawMessage `json:"data"`
}

Output

"model.Thing": {
	"type": "object",
	"properties": {
	  "data": {}
	}
}

Test Plan

make all

[ezequiel]

cc @sdghchj

[sharunkumar]