Change Upgrade Assistant Docs link to the Release docs page

[KOTungseth]

Summary

The Upgrade Assistant UI includes a Check the latest release highlights link that goes to a redirect page in the Docs.

Upgrade Assistant UI:

Docs redirect page:

Proposed change

Update the link to the Release docs page: https://www.elastic.co/guide/en/starting-with-the-elasticsearch-platform-and-its-solutions/current/new.html

[elasticmachine]

Pinging @elastic/kibana-management (Team:Kibana Management)

[mochi22]

Hi, Can I work on this?

I think the following corrections should be made:

-      latestReleaseHighlights: `${ELASTIC_WEBSITE_URL}guide/en/elastic-stack/current/elastic-stack-highlights.html`,
+      latestReleaseHighlights: `${ELASTIC_WEBSITE_URL}guide/en/starting-with-the-elasticsearch-platform-and-its-solutions/current/new.html`,