IDE-296 - Draft for CLT goBackNLayer

[dorastr]

IDE-296
CLT for motion brick goBackNLayers, only draft, because we still need to check the layers
(https://catrobat.atlassian.net/browse/IDE-296?atlOrigin=eyJpIjoiNWU1ODNhZjE3NzUyNDcxMTgwYTQ0MzdlYTExMWUwYTIiLCJwIjoiamlyYS1zbGFjay1pbnQifQ)

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud