Update support link in help menu (#166272)

Fixes: https://github.com/elastic/cloud/issues/117950

When the user clicks on 'Support' in help menu, they should be taken to
directly to https://support.elastic.co/home

x-pack/plugins/cloud/common/constants.ts

@@ -5,7 +5,7 @@
  * 2.0.
  */
 
-export const ELASTIC_SUPPORT_LINK = 'https://cloud.elastic.co/support';
+export const ELASTIC_SUPPORT_LINK = 'https://support.elastic.co/';
 
 /**
  * This is the page for managing your snapshots on Cloud.

x-pack/plugins/cloud/public/plugin.test.ts

@@ -185,7 +185,7 @@ describe('Cloud Plugin', () => {
       expect(coreStart.chrome.setHelpSupportUrl).toHaveBeenCalledTimes(1);
       expect(coreStart.chrome.setHelpSupportUrl.mock.calls[0]).toMatchInlineSnapshot(`
         Array [
-          "https://cloud.elastic.co/support",
+          "https://support.elastic.co/",
         ]
       `);
     });