Add testing for CalibrationInfo

[andy-bridger]

Description of work

Summary of work

Added some very lightweight Unit Tests to test the CalibrationInfo class

Fixes #38888 .

Further detail of work

Having looked more into it, I can see why there was no testing before - most of the functions are essentially if statements that link to different ws loaders or creators. I have just added coverage that checks that the different groups follow the correct paths through the logic. This is mainly for peace of mind when I start extending the Engineering Diffraction Interface for pole figures

To test:

See if it passes all unit tests and that these new ones have been included. Check if there is any other functionality that can be tested automatically

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Reviewer

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Functional Tests

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