lib/testmap: move fedora-42 to main for starter-kit

Let's validate that this image is at least minimally functional before
we merge it.

Author: allisonkarlitskaya

lib/testmap.py

@@ -78,6 +78,7 @@ def contexts(image: str, *scenarios: Iterable[str], repo: str | None = None) ->
             TEST_OS_DEFAULT,
             'fedora-40',
             'fedora-41',
+            'fedora-42',
             'centos-9-stream',
             'centos-10',
             'fedora-rawhide',
@@ -86,7 +87,6 @@ def contexts(image: str, *scenarios: Iterable[str], repo: str | None = None) ->
         ],
         '_manual': [
             'centos-9-bootc',
-            'fedora-42',
             'rhel-9-6',
             'rhel-8-10/ws-container',
         ]