Improve unit tests for model_parameters; add read parameters from file

[GernotMaier]

Add the following related to the model_parameters module:

• allow to change model_parameters read from a file. This is clearly an experimental feature (for now) and a corresponding warning is printed out. I would keep it as it is for now, until we find time to either replace or improve it (this functionality has been there before, see the replace in validate_cumulative_psf.py
• improve unit tests for model_parameters and get coverage to 100%.

[ctao-dpps-sonarqube]

Analysis Details

0 Issues

• 0 Bugs
• 0 Vulnerabilities
• 0 Code Smells

Coverage and Duplications

• 100.00% Coverage (91.20% Estimated after merge)
• 0.00% Duplicated Code (0.00% Estimated after merge)

Project ID: gammasim_simtools_AY_ssha9WiFxsX-2oy_w

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[tobiaskleiner]

All good, thanks. Do we need to open an issue to remove this in the future or to add additional validation steps?

[GernotMaier]

Thanks for the review!

I've added a issue #1084