Refactoring in unit tests

[andrsd]

• Adding a c-tor for SinglePhaseFluidProperties::Props
• Refactoring in air unit tests
• Refactoring in CO2 unit tests
• Refactoring in helium unit tests
• Refactoring in nitrogen unit tests
• Refactoring in ideal gas unit tests

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.03% 🎉

Comparison is base (4076908) 96.95% compared to head (edc532b) 96.99%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #38      +/-   ##
==========================================
+ Coverage   96.95%   96.99%   +0.03%     
==========================================
  Files          23       23              
  Lines        1512     1531      +19     
==========================================
+ Hits         1466     1485      +19     
  Misses         46       46              

Files Changed	Coverage Δ
include/SinglePhaseFluidProperties.h	100.00% <ø> (ø)
src/SinglePhaseFluidProperties.cpp	100.00% <100.00%> (ø)
test/src/Air_test.cpp	100.00% <100.00%> (ø)
test/src/CarbonDioxide_test.cpp	100.00% <100.00%> (ø)
test/src/Helium_test.cpp	100.00% <100.00%> (ø)
test/src/IdealGas_test.cpp	100.00% <100.00%> (ø)
test/src/Nitrogen_test.cpp	100.00% <100.00%> (ø)

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