Invalid JSON returned from the default QuarkusErrorHandler (Vert.x)

[pismy]

Describe the bug
Using vertx-http and quarkus-resteasy, if an exception is thrown in a JAX-RS endpoint and no ExceptionMapper catches it gets forwarded to QuarkusErrorHandler.

In case of application/json Accept header, the stack does not get properly escaped there.
More specifically, produces a JSON with a string including unencoded tab characters.

Environment:

• Quarkus 1.9.2.Final

Additional info
The same exact issue existed in Undertow QuarkusErrorServlet implementation
see: #9463

The fix to apply here is very similar to undertow fix

[gsmet]

@pismy would you like to prepare a PR?

[pismy]

Sure