Fix system highstate page layout

[Etheryte]

Part of https://github.com/SUSE/spacewalk/issues/18940

All urls below are specified as the dev proxy (yarn proxy https://...), since that's the most convenient way to work on these issues.

To switch between the new theme and the old theme in the console: debugUtils.toggleUpdatedTheme()
To switch between the Suma theme and the Uyuni theme: debugUtils.toggleTheme()

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See e.g. https://localhost:8080/rhn/manager/systems/details/highstate?sid=1000010006&

For this page, it's hard to say whether the old page or new page should be the baseline for fixing as they're both a bit broken.
I think it would be reasonable to just fix the page to a reasonably good state in the new theme, ignore the old theme part, and add the page to the updated page list.

Definition of done

The updated theme has no visual bugs, all related page urls are added to ViewHelper.java and view-helper.ts.