🔥 3572 remove tbr calculation

[chris-ashe]

This pull request focuses on removing the Tritium Breeding Ratio (TBR) calculation for the CCFE HCPB model and simplifying related code. The most important changes include the removal of the TBR calculation function, adjustments to related input variables, and updates to documentation and test files.

Removal of TBR calculation:

• process/hcpb.py: Removed the tbr_shimwell function, which calculates the Tritium Breeding Ratio.

Code adjustments:

• process/caller.py: Removed the code block that runs the TBR calculation for the CCFE HCPB model.
• process/init.py: Removed input checks and assignments related to iblanket_thickness for the TBR calculation.

Documentation updates:

• documentation/proc-pages/eng-models/fw-blanket.md: Updated the documentation to remove references to the TBR calculation for the CCFE HCPB model.

Test file updates:

• tests/integration/ref_dicts.json: Removed references to iblanket_thickness and the TBR calculation from the test configuration.

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

Attention: Patch coverage is 33.33333% with 2 lines in your changes missing coverage. Please review.

Project coverage is 31.67%. Comparing base (2083732) to head (7f05cb2).
Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
process/power.py	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3605      +/-   ##
==========================================
- Coverage   31.74%   31.67%   -0.08%     
==========================================
  Files          85       86       +1     
  Lines       20161    22242    +2081     
==========================================
+ Hits         6400     7045     +645     
- Misses      13761    15197    +1436     

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[timothy-nunn]

Just need to put iblanket_thickness into obsolete variables