Add required for JSON Patch remove

Add `required` members to the OpenAPI schema for a JSON Patch remove operation.

Author: martincostello

src/OpenApi/src/Services/Schemas/OpenApiSchemaService.cs

@@ -170,6 +170,7 @@ private static JsonObject CreateSchemaForJsonPatch()
         {
             [OpenApiSchemaKeywords.TypeKeyword] = "object",
             [OpenApiSchemaKeywords.AdditionalPropertiesKeyword] = false,
+            [OpenApiSchemaKeywords.RequiredKeyword] = JsonArray(["op", "path"]),
             [OpenApiSchemaKeywords.PropertiesKeyword] = new JsonObject
             {
                 ["op"] = new JsonObject()

src/OpenApi/test/Microsoft.AspNetCore.OpenApi.Tests/Integration/snapshots/OpenApi3_0/OpenApiDocumentIntegrationTests.VerifyOpenApiDocument_documentName=schemas-by-ref.verified.txt

@@ -696,6 +696,10 @@
               "additionalProperties": false
             },
             {
+              "required": [
+                "op",
+                "path"
+              ],
               "type": "object",
               "properties": {
                 "op": {

src/OpenApi/test/Microsoft.AspNetCore.OpenApi.Tests/Integration/snapshots/OpenApi3_1/OpenApiDocumentIntegrationTests.VerifyOpenApiDocument_documentName=schemas-by-ref.verified.txt

@@ -696,6 +696,10 @@
               "additionalProperties": false
             },
             {
+              "required": [
+                "op",
+                "path"
+              ],
               "type": "object",
               "properties": {
                 "op": {

src/OpenApi/test/Microsoft.AspNetCore.OpenApi.Tests/Integration/snapshots/OpenApiDocumentLocalizationTests.VerifyOpenApiDocumentIsInvariant.verified.txt

@@ -1485,6 +1485,10 @@
               "additionalProperties": false
             },
             {
+              "required": [
+                "op",
+                "path"
+              ],
               "type": "object",
               "properties": {
                 "op": {