Added filter nfinset in product search

- Deprecate "finset" and "nfinset" fields.

Author: VladimirZaets

app/code/Magento/GraphQl/etc/schema.graphqls

@@ -10,7 +10,6 @@ type Mutation {
 input FilterTypeInput @doc(description: "FilterTypeInput specifies which action will be performed in a query ") {
     eq: String @doc(description: "Equals")
     finset: [String] @deprecated (reason: "The finset filter is deprecated. Magento doesn't recomend to store comma separated values, therefore finset filter is redundant.")
-    nfinset: [String] @deprecated (reason: "The finset filter is deprecated. Magento doesn't recomend to store comma separated values, therefore finset filter is redundant.")
     from: String @doc(description: "From. Must be used with 'to'")
     gt: String @doc(description: "Greater than")
     gteq: String @doc(description: "Greater than or equal to")