Modify apply_estimation

[Jday7879]

Pull Request Title

overwrite config estimation

Summary

• calibration group mapping now loaded in apply estimation
• removed overwriting config in estimate
• calibration_group_map updated to calibration_group_map_path in config

Type of Change

• Bug fix
• New feature
• Breaking change
• Documentation update
• Other (please describe):

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• Installable with all dependencies recorded
• Runs without error
• Follows PEP8 and project-specific conventions
• Appropriate use of comments, for example, no descriptive comments
• Functions documented using Numpy style docstrings
• Assumptions and decisions log considered and updated if appropriate
• Unit tests have been updated to cover essential functionality for a reasonable range of inputs and conditions
• Other forms of testing such as end-to-end and user-interface testing have been considered and updated as required

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Reviewer Checklist

• Test suite passes (locally as a minimum)
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Additional Information

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[robertswh]

Changes are all good. Questioned whether putting the config read in lower level functions would be better, but Jordan rightly pointed out it's best to read the mapper outside the loop. Happy to merge.