Problem/Motivation
This came up in #3259925: [PP-1] Use Olivero instead of Bartik as example theme in documentation, to be precise: @Berdir brought this up in https://git.drupalcode.org/project/drupal/-/merge_requests/938#note_36419
There are a bunch of tests currently that loop over "all themes" but do not include Olivero.
Steps to reproduce
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Proposed resolution
Include Olivero in those tests.
Remaining tasks
User interface changes
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API changes
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Data model changes
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