Part of #1971384: [META] Convert page callbacks to controllers
For instructions on how to convert a page callback into a controller, see the WSCCI Conversion Guide.
Need to rewrite the whole module to make test sync with current test implementation. For more details, please refer: #1988802: [META] Rewrite test modules in system to provide better unit testing.
rolled up into #1987738: Convert menu_test_callback() to a new style controller
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