feat: add tryItOutEnabled configuration (#6865)

* feat: add tryItOutEnabled configuration

allow users to set tryItOutEnabled: true to display
the "Try it out" section by default

tryItOutEnabled to take === "true" for the
query string value or === true if someone
implements query string type parsing in the query

docker/configurator/variables.js

@@ -91,6 +91,10 @@ const standardVariables = {
     type: "array",
     name: "supportedSubmitMethods"
   },
+  TRY_IT_OUT_ENABLED: {
+    type: "boolean",
+    name: "tryItOutEnabled"
+  },
   VALIDATOR_URL: {
     type: "string",
     name: "validatorUrl"