front: add editor slice

[kmer2016]

closes #5299

• Replace editor reducer by the slice
• add test of editor state

[codecov]

Codecov Report

Attention: 16 lines in your changes are missing coverage. Please review.

Comparison is base (9eee792) 19.52% compared to head (7f7d363) 19.50%.
Report is 22 commits behind head on dev.

Files	Patch %	Lines
front/src/reducers/editor/index.ts	86.36%	5 Missing and 4 partials ⚠️
front/src/reducers/editor/selectors.ts	0.00%	4 Missing and 1 partial ⚠️
.../editor/components/InfraErrors/InfraErrorsList.tsx	0.00%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##                dev    #5682      +/-   ##
============================================
- Coverage     19.52%   19.50%   -0.02%     
  Complexity     2327     2327              
============================================
  Files           907      907              
  Lines        106965   106944      -21     
  Branches       2590     2587       -3     
============================================
- Hits          20881    20863      -18     
  Misses        84558    84558              
+ Partials       1526     1523       -3     

Flag	Coverage Δ
front	8.39% <79.48%> (-0.02%)	⬇️

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[clarani]

Thanks for your PR 🙏
Left some small comments

[clarani]

LGTM and tested the editor in local, everything seems to work ✅

Only left one last suggestion