[WIP] Background reports

[SchrodingersGat]

Work in progress to allow report generation in the background worker

• Crucial for long-running printing processes which would otherwise timeout the worker

TODO

• Offload report printing
• Offload label printing
• Playwright testing

Future Work

• Offload data export - [Feature] Data export plugins #9096
• Consolidate export output models into single table
• Save error message against printing output object

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[codecov]

Codecov Report

Attention: Patch coverage is 68.75000% with 35 lines in your changes missing coverage. Please review.

Project coverage is 86.15%. Comparing base (0d1ab4e) to head (9cb863e).
Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
...rontend/src/components/buttons/PrintingActions.tsx	35.29%	20 Missing and 2 partials ⚠️
...venTree/plugin/builtin/labels/inventree_machine.py	75.00%	4 Missing ⚠️
src/backend/InvenTree/report/models.py	84.00%	4 Missing ⚠️
...end/InvenTree/plugin/builtin/labels/label_sheet.py	0.00%	3 Missing ⚠️
src/frontend/src/hooks/UseForm.tsx	66.66%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #9199      +/-   ##
==========================================
- Coverage   86.15%   86.15%   -0.01%     
==========================================
  Files        1186     1186              
  Lines       52440    52501      +61     
  Branches     2211     2216       +5     
==========================================
+ Hits        45182    45234      +52     
+ Misses       6698     6696       -2     
- Partials      560      571      +11     

Flag	Coverage Δ
backend	88.06% <84.05%> (+<0.01%)	⬆️
pui	70.03% <44.18%> (+0.13%)	⬆️

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[matmair]

@SchrodingersGat is there a reason to have separate output models and endpoints for reports and labels or can we merge these? We seem to duplicate a lot of functions between the two

[SchrodingersGat]

It is a big duplication - and about to become a triplication with the data export plugins

If we moved all this onto one model, and define the "export type" field, then this could be reduced to a single model.

I might look into that after this PR, to reduce the scope

[sentry-io]

Suspect Issues

This pull request was deployed and Sentry observed the following issues:

• ‼️ ValidationError: {'error': ['Error generating report'], 'detail': ["Invalid HTTP_HOST header: 'testserver'. You may need to add 'testserver' to ALLOWED_HOSTS."], 'path': ['/']} report.models in print View Issue
• ‼️ ValidationError: ['Error printing labels', "Invalid HTTP_HOST header: 'testserver'. You may need to add 'testserver' to ALLOWED_HOSTS."] report.models in print View Issue

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