fix: response examples should respect media-type (#6456)

* response sample generation should take content type into consideration for stringify

test/e2e-cypress/static/documents/bugs/6442.yaml

@@ -0,0 +1,52 @@
+openapi: 3.0.1
+info:
+  title: Example Swagger
+  version: '1.0'
+servers:
+  - url: /api/v1
+paths:
+  /xmlTest:
+    get:
+      summary: subscribes to a siri vm stream
+      operationId: xmlTest
+      parameters: []
+      responses:
+        '200':
+          description: Simple example
+          content:
+            application/xml:
+              schema:
+                type: object
+                xml:
+                  name: root
+                properties:
+                  x:
+                    type: string
+                example: 
+                  x: what the f
+              examples:
+                x2:
+                  summary: "xml not rendered via 'examples' keyword"
+                  value:
+                    x: should be xml
+  /xmlTest2:
+    get:
+      summary: subscribes to a siri vm stream
+      operationId: xmlTest2
+      parameters: []
+      responses:
+        '200':
+          description: Simple example
+          content:
+            application/xml:
+              schema:
+                type: object
+                xml:
+                  name: root
+                properties:
+                  x:
+                    type: string
+                example: 
+                  x: what the f
+              example:
+                x: should be xml

test/e2e-cypress/tests/bugs/6442.js

@@ -0,0 +1,33 @@
+describe("#6442: 'Examples' keyword definitions can not be rendered as xml", () => {
+    it("should render response examples accourdingly to content-type xml", () => {
+        const xmlIndicator = "<x>should be xml</x>"
+
+        cy
+            .visit("?url=/documents/bugs/6442.yaml")
+            .get("#operations-default-xmlTest")
+            .click()
+            .get(".responses-wrapper")
+            .within(() => {
+                cy
+                    .get(".microlight")
+                    .should("include.text", xmlIndicator)
+            })
+    })
+})
+
+describe("#6442: 'Example' keyword definitions can not be rendered as xml", () => {
+    it("should render response examples accourdingly to content-type xml", () => {
+        const xmlIndicator = "<x>should be xml</x>"
+
+        cy
+            .visit("?url=/documents/bugs/6442.yaml")
+            .get("#operations-default-xmlTest2")
+            .click()
+            .get(".responses-wrapper")
+            .within(() => {
+                cy
+                    .get(".microlight")
+                    .should("include.text", xmlIndicator)
+            })
+    })
+})