podman generate systemd --new do not duplicate params

podman generate systemd --new inserts extra idfile arguments. The
generated unit can break when the user did provide their own idfile
arguments as they overwrite the arguments added by generate systemd.
This also happens when a user tries to generate the systemd unit on
a container already create with a --new unit. This should now
create a identical unit. The solution is to remove all user provided
idfile arguments.

This commit also ensures that we do not remove arguments that are part
off the containers entrypoint.

Fixes #9776

Signed-off-by: Paul Holzinger <paul.holzinger@web.de>

pkg/systemd/generate/pods_test.go

@@ -320,6 +320,25 @@ WantedBy=multi-user.target default.target
 			false,
 			false,
 		},
+		{"pod --new with ID files",
+			podInfo{
+				Executable:       "/usr/bin/podman",
+				ServiceName:      "pod-123abc",
+				InfraNameOrID:    "jadda-jadda-infra",
+				RestartPolicy:    "on-failure",
+				PIDFile:          "/run/containers/storage/overlay-containers/639c53578af4d84b8800b4635fa4e680ee80fd67e0e6a2d4eea48d1e3230f401/userdata/conmon.pid",
+				StopTimeout:      10,
+				PodmanVersion:    "CI",
+				GraphRoot:        "/var/lib/containers/storage",
+				RunRoot:          "/var/run/containers/storage",
+				RequiredServices: []string{"container-1", "container-2"},
+				CreateCommand:    []string{"podman", "pod", "create", "--infra-conmon-pidfile", "/tmp/pod-123abc.pid", "--pod-id-file", "/tmp/pod-123abc.pod-id", "--name", "foo", "bar=arg with space"},
+			},
+			podGoodNamedNew,
+			true,
+			false,
+			false,
+		},
 	}
 
 	for _, tt := range tests {