Fixed the issue when DEM couldn't find the existing repositories.

[janosmurai]

Type Of Change

• [ ] New feature (non-breaking change which adds functionality)
• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [x] Any modification in the test cases
• [ ] Any modification in the documentation

Checklist:

• [x] I have read and followed the contribution guideline.
• [x] I have checked to ensure there aren't other open Pull Requests for the same update/change.
• [x] All the test cases pass and new modifications in the production code are 100% covered.
• [ ] I have made corresponding changes to the documentation.

Related Issue

Closing: DEM-289

Description

DEM couldn't find the images available from the registries, because it loaded the repo information without the namespece (DockerHub) and URL (other registries) information. The fix was to prepend these information when updating the Registry classes.

How Has This Been Tested?

Tested on Ubuntu 22.04