Merge branch 'fix/grid-geom-thread-safe' into 'master'

[bugfix][gridgeometry] Always construct bboxtree and element map

Closes #1151

See merge request !3095

(cherry picked from commit cefb6a43)

0528733e [test][1p] Fix missing overload of gridView.grid() for mock grid
e23967f7 [bugfix][gridgeometry] Always construct bboxtree and element map