MUDSample scene is missing with Package manager import

[juans-chainsafe]

Using https://www.notion.so/chainsafe/Simulating-OpenUPM-scenario-locally-16ac51527f6f4f35a73cd521472c7a50#984311877bf540e0b815fa6ba04b1210 to import the project in dev branch, we are missing the MudSample scene as we don't have samples for that dependency.