Y26-050 - Performance improvements for the GBS pipeline - Fix #1

[KatyTaylor]

Closes #

Changes proposed in this pull request

• See explanation here - Y26-050 - Performance improvements for the GBS pipeline #5575 (comment)
• Add 'distinct' to in_state scope. It was bringing back duplicates, due to the joins, and causing a long list containing duplicates to appear on the pooled_tubes_from_whole_plates page in Limber. To do: add unit test, and probably add same fix for Tube equivalent.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.36%. Comparing base (4d3a8a3) to head (7a0e669).
⚠️ Report is 55 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #5775      +/-   ##
===========================================
- Coverage    87.35%   86.36%   -0.99%     
===========================================
  Files         1477     1479       +2     
  Lines        33526    33580      +54     
  Branches      3550     3553       +3     
===========================================
- Hits         29285    29002     -283     
- Misses        4220     4557     +337     
  Partials        21       21              

Flag	Coverage Δ
javascript	72.72% <ø> (+22.72%)	⬆️
ruby	86.37% <100.00%> (-0.99%)	⬇️

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