875: ensure that site.species site-settings does not remove in-use taxonomy

[naknomum]

#875 fix site-setting api to disallow updating site.species to remove an in-use Taxonomy

[erinz2020]

looks good to me

[codecov]

Codecov Report

Merging #926 (adebb1a) into main (a73f87e) will decrease coverage by 0.1%.
The diff coverage is 83.3%.

Additional details and impacted files

@@           Coverage Diff           @@
##            main    #926     +/-   ##
=======================================
- Coverage   73.3%   73.3%   -0.1%     
=======================================
  Files        238     238             
  Lines      23373   23395     +22     
  Branches    4223    4232      +9     
=======================================
+ Hits       17154   17159      +5     
- Misses      4970    4981     +11     
- Partials    1249    1255      +6     

Files	Coverage Δ
app/modules/site_settings/helpers.py	79.5% <83.3%> (+<0.1%)	⬆️
app/modules/site_settings/models.py	77.5% <83.3%> (+0.1%)	⬆️

... and 2 files with indirect coverage changes

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