Improve the efficiency of the heat rate parameter migration script

[nhniina]

This update removes unnecessary looping and individual parameter value queries.

Checklist before merging

• Documentation is up-to-date
• Unit tests have been added/updated accordingly
• Code has been formatted according to SpineOpt's style
• Unit tests pass

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.81%. Comparing base (5fc28a5) to head (cacf9a2).
Report is 50 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1093      +/-   ##
==========================================
- Coverage   86.82%   86.81%   -0.02%     
==========================================
  Files         143      143              
  Lines        4121     4117       -4     
==========================================
- Hits         3578     3574       -4     
  Misses        543      543              

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