Y26-129 - Tidy sample manifests

[StephenHulme]

Small refactors and changes to sample manifests in preparation for #5797

Changes proposed in this pull request

• Encapsulate functions in update_sample
• Move sample manifest barcodes into their own config file
• Use a single sample manifest upload template and side links
• Record manifest name with same event data
• Allow specialised fields to known their name
• Clarify docstrings and list formatting
• Move i5,i7 checks to private methods
• Remove rubocop todos

Instructions for Reviewers

[All PRs] - Confirm PR template filled
[Feature Branches] - Review code
[Production Merges to main]
    - Check story numbers included
    - Check for debug code
    - Check version

[codecov]

Codecov Report

❌ Patch coverage is 87.17949% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 87.29%. Comparing base (6bdbfe3) to head (7ef238c).

Files with missing lines	Patch %	Lines
app/models/event/plate_creation_event.rb	0.00%	0 Missing and 2 partials ⚠️
app/models/event/sample_logistics_qc_event.rb	0.00%	0 Missing and 1 partial ⚠️
app/models/event/sample_manifest_event.rb	66.66%	0 Missing and 1 partial ⚠️
lib/event_factory.rb	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #5796      +/-   ##
===========================================
- Coverage    87.31%   87.29%   -0.02%     
===========================================
  Files         1480     1480              
  Lines        33637    33643       +6     
  Branches      3569     3568       -1     
===========================================
+ Hits         29369    29370       +1     
- Misses        4247     4248       +1     
- Partials        21       25       +4     

Flag	Coverage Δ
javascript	76.31% <ø> (ø)
ruby	87.30% <87.17%> (-0.01%)	⬇️

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