Improve 'findability' of Early Access Builds

We want to ensure that developers needing early access builds can find them and that they are named correctly (we no longer build 'nightly', we build based on the upstream repo having a new tag available.

Repeating content from https://github.com/adoptium/ci-jenkins-pipelines/issues/1256#issuecomment-3223927562 for convenience.

Right now its a little awkward / non-intuitive to find EA builds, but you can:
- go to https://adoptium.net/temurin/releases
- scroll down to find "Other ways to download Temurin"
- Find "Other Downloads" and click on the "Nightly Builds" link
- Takes you to https://adoptium.net/temurin/nightly

- Suggest to renaming the "Nightly Builds" link to "Early Access Builds"
- Possibly changing the page URL from https://adoptium.net/temurin/nightly to https://adoptium.net/temurin/earlyaccess

Is there a way to represent EA builds making them easier to locate? Doesn't seem correct to have them in the section called "Other ways to download Temurin".

Start by inspecting the Temurin releases page and the Nightly Builds page at adoptium.net/temurin/releases and adoptium.net/temurin/nightly. Trace how the link is labelled and where the early-access page is exposed, then determine whether the link text, page URL, or surrounding navigation should change. Done means developers can find the EA builds and the naming no longer implies nightly builds.

Written by the indexing model from the issue text.