Prevent removing parameter overrides on first schema generation

This is ground work for #264 (closed). While working on this issue, I noticed that generating the schema once caused a lot of declared filters to be missing on all the subsequent generations for as long as the server is running; it turns out a .pop() on a dict caused the overriden parameters to go missing.

The failing test on !759 (merged) demonstrates the issue: https://gitlab.com/arkindex/backend/-/jobs/571343657

Codecov Report

Merging #759 into master will increase coverage by 0.00%. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #759   +/-   ##
=======================================
  Coverage   86.24%   86.24%           
=======================================
  Files         198      198           
  Lines       13340    13341    +1     
=======================================
+ Hits        11505    11506    +1     
  Misses       1835     1835           

Impacted Files	Coverage Δ
arkindex/project/openapi/schemas.py	96.22% <100.00%> (+0.07%)

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mentioned in merge request api-client!177 (merged)

changed the description

assigned to @babadie and unassigned @erwanrouchet

mentioned in merge request !760 (merged)

added 5 commits

• 1dea8126...16a52c36 - 4 commits from branch master
• bdad527d - Prevent issues with multiple schema generations at once

Compare with previous version

mentioned in commit e99b8e18

merged