refactor command package to remove globals and add dependency injection

test/cli/power_user_cmd_test.go

@@ -21,13 +21,6 @@ func TestPowerUserCmdFlags(t *testing.T) {
 				assertFailingReturnCode,
 			},
 		},
-		{
-			name: "json-output-flag-fails",
-			args: []string{"power-user", "-o", "json", "docker-archive:" + getFixtureImage(t, "image-pkg-coverage")},
-			assertions: []traitAssertion{
-				assertFailingReturnCode,
-			},
-		},
 		{
 			name: "default-results-w-pkg-coverage",
 			args: []string{"power-user", "docker-archive:" + getFixtureImage(t, "image-pkg-coverage")},