Improve ParseDevfileAndValidate tests

[kim-tsao]

Which area/kind this issue is related to?

/area library

Issue Description

Currently, there's some unit test coverage for this function but it only covers a subset of parser args. We are missing coverage for Path, URL, RegistryURLs, DefaultNamespace, Context and K8sClient.

[github-actions]

This issue is stale because it has been open for 90 days with no activity. Remove stale label or comment or this will be closed in 60 days.

[feloy]

Fixed by devfile/library#183