`ApiLayoutControllerGetTest` is not actually using what `ApiLayoutControllerTestBase` provides, leading to very confusing code

Overview

Discovered in 📌 [PP-2] Accept Dynamic Props in ApiTemplateLayoutController for content templates Postponed .

See write-up about the WTF: https://git.drupalcode.org/project/canvas/-/merge_requests/58/diffs#note...

Related: 📌 Decouple kernel tests from XbTestSetup Active

Proposed resolution

User interface changes