y26-118 mysql 8.4 testing

[andrewsparkes]

Changes to accommodate mysql 8.4
Re-added PlateTemplate api v2 resource

Closes #5673

[codecov]

Codecov Report

❌ Patch coverage is 64.28571% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 87.28%. Comparing base (03dff92) to head (562ab51).

Files with missing lines	Patch %	Lines
app/controllers/plate_templates_controller.rb	0.00%	5 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #5702      +/-   ##
===========================================
- Coverage    87.30%   87.28%   -0.02%     
===========================================
  Files         1467     1469       +2     
  Lines        33167    33180      +13     
  Branches      3496     3496              
===========================================
+ Hits         28955    28960       +5     
- Misses        4191     4199       +8     
  Partials        21       21              

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[BenTopping]

Looks ok to me.
Why did plate templates resource need restoring, is it used somewhere?