Further examples of unit testing Central Node using mocks

Settrequested to merge
SAR-68/test-command-with-mock into master

Two more test cases that exemplify the use of mocking, along with the PyTango DeviceTestContext. With a view to exercise some of CentralNode's Tango Commmand and Tango Attributes.

This extends the work in https://gitlab.com/ska-telescope/tmc-prototype/-/merge_requests/23

Edited by Sett

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