fre make create-checkout pytest

[singhd789]

Is your feature request related to a problem? Please describe.
fre make create-checkout needs an associated test.

Describe the solution you'd like
Tests could include

• existence of model yaml, platform yaml, and compile yaml
• successful creation of checkout script (container - checkout script would be in tmp location, non-container - checkout script would be in modelRoot location)
• successful running of checkout script
• test for -npc option if a container platform is used - failure if it is not used with container platform
• Create a compile yaml that points to a non-existent repository (checkout fail)
• other failures.....