[Plugin] Enhancements for serial number validation

[SchrodingersGat]

• Provide more information to plugins when running serial number generation functions
• Improve error handling
• Add get_latest_serial_number method to ValidationMixin class

[netlify]

✅ Deploy Preview for inventree-web-pui-preview canceled.

Name	Link
🔨 Latest commit	d46271d
🔍 Latest deploy log	https://app.netlify.com/sites/inventree-web-pui-preview/deploys/6711c5bb71c5f5000814ad3c

[codecov]

Codecov Report

Attention: Patch coverage is 42.66667% with 43 lines in your changes missing coverage. Please review.

Project coverage is 84.26%. Comparing base (c9a4e6b) to head (d46271d).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/backend/InvenTree/part/models.py	30.43%	16 Missing ⚠️
src/backend/InvenTree/InvenTree/helpers.py	38.88%	11 Missing ⚠️
...ee/plugin/samples/integration/validation_sample.py	37.50%	10 Missing ⚠️
src/backend/InvenTree/part/api.py	25.00%	3 Missing ⚠️
src/backend/InvenTree/plugin/plugin.py	33.33%	2 Missing ⚠️
...venTree/plugin/base/integration/ValidationMixin.py	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #8311      +/-   ##
==========================================
- Coverage   84.29%   84.26%   -0.04%     
==========================================
  Files        1165     1165              
  Lines       52797    52845      +48     
  Branches     1931     1931              
==========================================
+ Hits        44504    44528      +24     
- Misses       7809     7833      +24     
  Partials      484      484              

Flag	Coverage Δ
backend	85.90% <42.66%> (-0.04%)	⬇️

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