[12.x] Fix 'can' function that was defined in RouterRegistrar in #54648 #57072
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I saw that a
can
function was added to the $allowedAttributes array in PR #54648 but this did not actually work for route groups. This has the potential for security issues in applications that assumecan
works because it's in the allowedAttributes array when it actually doesn't, which for untested endpoints means you could potentially access unauthorized routes. This change adds it to the route middleware when assigning it to the route actions, which makes it work.The test failed before this PR but works after the changes.