editoast: Add tests for mvt tile creation

[bloussou]

Add a test for tile creation with content to avoid future regressions

[codecov]

Codecov Report

Merging #3065 (4050cb0) into dev (d5c9934) will increase coverage by 0.23%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##                dev    #3065      +/-   ##
============================================
+ Coverage     38.65%   38.89%   +0.23%     
  Complexity     1707     1707              
============================================
  Files           602      602              
  Lines         18745    18745              
  Branches       2516     2516              
============================================
+ Hits           7246     7290      +44     
+ Misses        11091    11047      -44     
  Partials        408      408              

Flag	Coverage Δ
editoast	72.38% <ø> (+1.83%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
editoast/src/views/layers/mvt_utils.rs	79.03% <ø> (+61.29%)	⬆️
editoast/src/map/bounding_box.rs	20.40% <0.00%> (+2.04%)	⬆️
editoast/src/generated_data/utils.rs	84.21% <0.00%> (+5.26%)	⬆️
editoast/src/schema/geo_json.rs	50.00% <0.00%> (+50.00%)	⬆️

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