[json] Provide a flag in json schema to ignore a property in proposals. For #33083

src/vs/base/common/jsonSchema.ts

@@ -45,6 +45,7 @@ export interface IJSONSchema {
 	patternErrorMessage?: string; // VSCode extension
 	deprecationMessage?: string; // VSCode extension
 	enumDescriptions?: string[]; // VSCode extension
+	doNotSuggest?: boolean; // VSCode extension
 }
 
 export interface IJSONSchemaMap {