[WIP] Testable parts

[SchrodingersGat]

• Adds a new field to the part model - testable
• Separates the concept of testable from trackable
• Allows stock items to have associated tests, without associated serial numbers (necessarily)
• Default value for testable is the current value of trackable

TODO

• Update demo dataset - Adds "testsable" field to part model demo-dataset#77
• Update API
• Update CUI
• Update PUI
• Update playwright tests
• Update API unit tests
• Update documentation

[netlify]

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Name	Link
🔨 Latest commit	a48f38f
🔍 Latest deploy log	https://app.netlify.com/sites/inventree-web-pui-preview/deploys/66beb635017fe900081d2411

[codecov]

Codecov Report

Attention: Patch coverage is 91.30435% with 2 lines in your changes missing coverage. Please review.

Project coverage is 83.74%. Comparing base (f14094c) to head (a48f38f).
Report is 5 commits behind head on master.

Files	Patch %	Lines
...venTree/part/migrations/0129_auto_20240815_0214.py	80.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #7888      +/-   ##
==========================================
+ Coverage   83.35%   83.74%   +0.38%     
==========================================
  Files        1128     1130       +2     
  Lines       50276    50298      +22     
  Branches     1734     1735       +1     
==========================================
+ Hits        41908    42122     +214     
+ Misses       7937     7716     -221     
- Partials      431      460      +29     

Flag	Coverage Δ
backend	85.22% <90.47%> (+<0.01%)	⬆️
pui	66.67% <100.00%> (+2.37%)	⬆️

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[matmair]

LGTM; This separation makes a lot of sense