Improve error reporting for https access when quarkus.ssl.native=false

Removing the catch for `com.oracle.svm.core.jdk.UnsupportedFeatureError`
as it appears like it's never caught any more.

docs/src/main/asciidoc/native-and-ssl.adoc

@@ -151,7 +151,7 @@ The native executable tests will fail with the following error:
 
 [source]
 ----
-Caused by: java.net.MalformedURLException: Accessing an URL protocol that was not enabled. The URL protocol https is supported but not enabled by default. It must be enabled by adding the --enable-url-protocols=https option to the native-image command..
+Caused by: java.lang.IllegalArgumentException: https://stage.code.quarkus.io/api requires SSL support but it is disabled. You probably have set quarkus.ssl.native to false.
 ----
 
 This error is the one you obtain when trying to use SSL while it was not explicitly enabled in your native executable.

extensions/resteasy-classic/rest-client/runtime/src/main/java/io/quarkus/restclient/runtime/RestClientBase.java

@@ -313,13 +313,12 @@ private void configureBaseUrl(RestClientBuilder builder) {
         try {
             builder.baseUrl(new URL(baseUrl));
         } catch (MalformedURLException e) {
-            throw new IllegalArgumentException("The value of URL was invalid " + baseUrl, e);
-        } catch (Exception e) {
-            if ("com.oracle.svm.core.jdk.UnsupportedFeatureError".equals(e.getClass().getCanonicalName())) {
+            if (e.getMessage().contains(
+                    "It must be enabled by adding the --enable-url-protocols=https option to the native-image command")) {
                 throw new IllegalArgumentException(baseUrl
                         + " requires SSL support but it is disabled. You probably have set quarkus.ssl.native to false.");
             }
-            throw e;
+            throw new IllegalArgumentException("The value of URL was invalid " + baseUrl, e);
         }
     }