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

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

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)
+            })
+    })
+})