convert ccfe hcpb to dataclass

[clmould]

Description

Checklist

I confirm that I have completed the following checks:

• My changes follow the PROCESS style guide
• I have justified any large differences in the regression tests caused by this pull request in the comments.
• I have added new tests where appropriate for the changes I have made.
• If I have had to change any existing unit or integration tests, I have justified this change in the pull request comments.
• If I have made documentation changes, I have checked they render correctly.
• I have added documentation for my change, if appropriate.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 91.30435% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 51.38%. Comparing base (b399d1a) to head (5319eaf).

Files with missing lines	Patch %	Lines
process/models/blankets/hcpb.py	66.66%	4 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4243   +/-   ##
=======================================
  Coverage   51.38%   51.38%           
=======================================
  Files         151      151           
  Lines       30039    30015   -24     
=======================================
- Hits        15435    15424   -11     
+ Misses      14604    14591   -13     

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