adding tests for creating and deleting customized images.

### Summary

This issue involves adding tests for creating and deleting customized images.

### Context

The tests will ensure that the functionality for customized images works as intended. This includes verifying settings and session management.

### Acceptance criteria

1. Add 'Container Registry For Image Commit' settings to the project.
1. Configure account settings if the registry is private.
1. Create a session.
1. Commit the image.
1. Verify the image appears correctly on the my environments page.
1. Create a session using the committed image.
1. Delete all previously created sessions to avoid side effects.
1. Delete the custom image.
1. Confirm the image does not exist on both the my environments page and the session creation page.

### Other information

The harbor information and project registry information should be configured separately in the config file.

JIRA Issue: FR-1835