WEB-9804 - update nav reduce size - #39760
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What does this PR do? What is the motivation?
This PR scopes the desktop left sidenav so that Levels 3-4 (the detailed sub-navigation) only render for the top-level section containing the current page, instead of shipping
every product's full sub-nav tree on every page load. This significantly reduces the size of the nav HTML shipped per page. Client-side navigation (pjax) is updated to re-sync the
nav content on each page load so it stays correctly scoped to the new page's section as you navigate.
Before, every page shipped the entire Level 3-4 nav tree for every top-level section (~1.37 MB, identical everywhere). Now each page only ships Level 3-4 for its own section, cutting nav HTML by roughly two-thirds and total page size by ~28%. This matches expectations, and it's consistent with the /tracing/trace_collection/ expand behavior now working correctly on staging.
Merge readiness
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