[Interactive setup] Removed default port from cluster address form (elastic#230582)

## Summary

Removed default port from interactive setup cluster address form, unless
it is specified by the user.

### Checklist

- [x] [Unit or functional
tests](https://www.elastic.co/guide/en/kibana/master/development-tests.html)
were updated or added to match the most common scenarios
- [x] The PR description includes the appropriate Release Notes section,
and the correct `release_note:*` label is applied per the
[guidelines](https://www.elastic.co/guide/en/kibana/master/contributing.html#kibana-release-notes-process)

__Fixes: https://github.com/elastic/kibana/issues/221043__

## Release note

Removed default port from interactive setup cluster address form, unless
it is specified by the user.

Author: elena-shostak

src/platform/plugins/private/interactive_setup/public/cluster_address_form.test.tsx

@@ -41,7 +41,7 @@ describe('ClusterAddressForm', () => {
     await waitFor(() => {
       expect(coreStart.http.post).toHaveBeenLastCalledWith('/internal/interactive_setup/ping', {
         body: JSON.stringify({
-          host: 'https://localhost:9200',
+          host: 'https://localhost',
         }),
       });
       expect(onSuccess).toHaveBeenCalled();

src/platform/plugins/private/interactive_setup/public/cluster_address_form.tsx

@@ -74,13 +74,12 @@ export const ClusterAddressForm: FunctionComponent<ClusterAddressFormProps> = ({
     },
     onSubmit: async (values) => {
       const url = new URL(values.host);
-      const host = `${url.protocol}//${url.hostname}:${url.port || 9200}`;
 
       const result = await http.post<PingResult>('/internal/interactive_setup/ping', {
-        body: JSON.stringify({ host }),
+        body: JSON.stringify({ host: url.origin }),
       });
 
-      onSuccess?.(result, { host });
+      onSuccess?.(result, { host: url.origin });
     },
   });