Use distance unit from project's CRS for Stakeout panel

[iiLubos]

CU-861nbagwq
https://wishlist.merginmaps.com/p/yards-as-unit-for-stakeout

In case of distance in feet:

[PeterPetrik]

For testing @jozef-budac

map canvas crs in meters
override to feets in qgis project settings

[jozef-budac]

Everything works well. I just verified, that changing units for distance in project preferences changes also units in staking in input

[PeterPetrik]

unrelated test failures

[PeterPetrik]

@iiLubos can you an unit tests here https://github.com/MerginMaps/input/blob/897285b166a56d47af6c935d96aaa278ad48641f/app/test/testutilsfunctions.cpp#L170

I suggest
1/ Create function (not Q_INVOCABLE) String InputUtils::formatDistanceInDistanceUnit( const double distanceInMeters, int precision, Qgis::DistanceUnit distUnit ).
2/ Only test this new function formatDistanceInDistanceUnit, so tests are not dependent on all QgsProject

[tomasMizera]

@iiLubos We will merge this one, please add the test in another PR