Remove django-import-export

[SchrodingersGat]

This can now be replaced entirely by the new import / export framework which uses the DRF API.

TODO

• Remove dead code
• Update documentation for data import
• Update documentation for data export
• Reimplement "bom export" in new framework - [1.0.0] Reimplement old BOM exporter #8686

[netlify]

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[matmair]

Lgtm; might also enable removal of remaining Ajax (backend) functions.

[codecov]

Codecov Report

Attention: Patch coverage is 95.00000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 85.16%. Comparing base (933330f) to head (d5dca17).
Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
src/backend/InvenTree/part/bom.py	0.00%	2 Missing ⚠️
src/backend/InvenTree/InvenTree/views.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #8685      +/-   ##
==========================================
- Coverage   85.24%   85.16%   -0.08%     
==========================================
  Files        1175     1170       -5     
  Lines       52444    51474     -970     
  Branches     2089     2087       -2     
==========================================
- Hits        44704    43839     -865     
+ Misses       7241     7135     -106     
- Partials      499      500       +1     

Flag	Coverage Δ
backend	86.88% <95.00%> (-0.08%)	⬇️
migrations	43.05% <95.00%> (-0.14%)	⬇️
pui	69.09% <ø> (+0.08%)	⬆️

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[matmair]

@SchrodingersGat there are quite a lot of now uncovered lines that seem only necesarry for the old import method - are they needed for #8686 or can we clean them up? https://app.codecov.io/gh/inventree/InvenTree/pull/8685/indirect-changes

[SchrodingersGat]

@matmair good point, I had missed some pruning - see #8756