Update skykeycmd test structure

MERGE REQUEST

MR Guidelines

Overview

This is another MR related to #4025 (closed) to update siac test structure.

In this MR skykeycmd test was broken down to subtests and partial decoupling of tests from global variables was done.

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Checklist

Review and complete the checklist to ensure that the MR is complete before assigned to an approver.

• All new methods or updated methods have clear docstrings
• Testing added or updated for new methods
• Any new packages are added to Makefile and .gitlab-ci.yml
• API documentation updated for API updates
• Module README.md updated for changes to workflow
• Issue added to Sia-UI repo for new supporting features
• Changelog File Created

Issues Closed