Do not in-place mutate in the ispyb functions

[stephen-riggs]

This in-place mutation is unintentional and may impact the values we insert into the databases, particularly with the calculations about search map locations

[codecov]

Codecov Report

❌ Patch coverage is 27.77778% with 13 lines in your changes missing coverage. Please review.
✅ Project coverage is 54.54%. Comparing base (a73c037) to head (b76c064).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #853      +/-   ##
==========================================
+ Coverage   54.52%   54.54%   +0.01%     
==========================================
  Files         104      104              
  Lines       11092    11092              
  Branches     1472     1472              
==========================================
+ Hits         6048     6050       +2     
+ Misses       4723     4721       -2     
  Partials      321      321              

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