Use xml for coverage info

[matmair]

This PR improve python coverage accuracy for coveralls to keep if comparable with codecov; especially coverage on multilines. Follow up to #6945

[netlify]

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Name	Link
🔨 Latest commit	c295d24
🔍 Latest deploy log	https://app.netlify.com/sites/inventree-web-pui-preview/deploys/66141dbc54710200083a0f17

[matmair]

this messes with codecov settings - do not merge

[codecov]

Codecov Report

Attention: Patch coverage is 87.50000% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 84.34%. Comparing base (4adce85) to head (be6e318).

❗ Current head be6e318 differs from pull request most recent head c295d24. Consider uploading reports for the commit c295d24 to get more accurate results

Files	Patch %	Lines
tasks.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6947      +/-   ##
==========================================
- Coverage   85.44%   84.34%   -1.10%     
==========================================
  Files         803      873      +70     
  Lines       39492    40798    +1306     
  Branches        0      283     +283     
==========================================
+ Hits        33742    34412     +670     
- Misses       5750     6313     +563     
- Partials        0       73      +73     

Flag	Coverage Δ
backend	85.54% <87.50%> (+0.10%)	⬆️

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[matmair]

Read for review

[SchrodingersGat]

So many commits for such a small overall change :)

[matmair]

The smaller the final diff the happier I am ;-)
This revealed a lot of holes in coverage where coveralls falsely assumed statements were covered but codecov showed they were not. Now the score on coveralls is far more acurate