[Discover] Fix Discover breadcrumb losing context after page refresh or when opening in a new tab #136749
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Summary
This PR fixes an issue in Surrounding documents and Single document where the breadcrumb back to Discover loses context after a page refresh or when opening in a new tab, causing the application state to reset when navigating back to Discover:
Fixes #136134.
Checklist
Any text added follows EUI's writing guidelines, uses sentence case text and includes i18n supportDocumentation was added for features that require explanation or tutorialsAny UI touched in this PR is usable by keyboard only (learn more about keyboard accessibility)Any UI touched in this PR does not create any new axe failures (run axe in browser: FF, Chrome)If a plugin configuration key changed, check if it needs to be allowlisted in the cloud and added to the docker listThis renders correctly on smaller devices using a responsive layout. (You can test this in your browser)For maintainers