reactivate s2 calculations and tests on macos

[goergen95]

Because s2-based calculations have been throwing errors only on MacOS we disabled s2 and instead used lwgeom on these operating systems. This lead to numerically different results thus also tests have been disabled. This PR tries to reactivate s2 and associated tests for MacOS.

[codecov-commenter]

Codecov Report

Base: 81.34% // Head: 80.90% // Decreases project coverage by -0.45% ⚠️

Coverage data is based on head (cffcb65) compared to base (c995c04).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #131      +/-   ##
==========================================
- Coverage   81.34%   80.90%   -0.45%     
==========================================
  Files          39       39              
  Lines        2504     2509       +5     
==========================================
- Hits         2037     2030       -7     
- Misses        467      479      +12     

Impacted Files	Coverage Δ
R/calc_indicator.R	72.00% <ø> (+1.45%)	⬆️
R/calc_treecover_area.R	88.31% <ø> (ø)
R/calc_treecover_area_and_emissions.R	79.80% <ø> (ø)
R/calc_treecoverloss_emissions.R	84.41% <ø> (ø)
R/get_nasa_grace.R	70.83% <ø> (ø)
R/get_resource.R	70.27% <ø> (ø)
R/get_nasa_srtm.R	24.32% <100.00%> (-29.25%)	⬇️
R/utils.R	89.02% <100.00%> (ø)

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