fix(syntaxHighlighter): request and response examples for json cases (#7199)

* OAS 2 request and response examples for json cases
* OAS 3 request and response examples for json cases
* OAS2 and OAS3 tests
* jsonParse utils for syntax highlighting

src/core/utils/jsonParse.js

@@ -0,0 +1,15 @@
+export function canJsonParse(str) {
+  try {
+    let testValueForJson = JSON.parse(str)
+    return testValueForJson ? true : false
+  } catch (e) {
+    // exception: string is not valid json
+    return null
+  }
+}
+
+export function getKnownSyntaxHighlighterLanguage(val) {
+  // to start, only check for json. can expand as needed in future
+  const isValidJson = canJsonParse(val)
+  return isValidJson ? "json" : null
+}