Stretched button in subscription matching

[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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https://localhost:8080/rhn/manager/subscription-matching

This page is a bit wonky on both the old theme and the new, for now let's just fix the very obvious button bug, we can come back to the rest of it later.

We can probably (?) fix this by using width: fit-content or similar on the generic button styles, we just need to check it doesn't break anything else.

Definition of done

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

[Etheryte]

Same bug on https://localhost:8080/rhn/audit/Search.do