Properly destruct the TGeoManger

If the ROOT session is closed after the macro there is a problem with the destruction of the TGeoManger. Destruct the TGeoManager properly by calling the macro RemoveGeoManager. Add the call in macros where it was missing.

added BugFix Build System labels

Dear @i.selyuzhenkov, @v.singhal, @n.herrmann, @i.deppner,

you have been identified as code owner of at least one file which was changed with this merge request.

Please check the changes and approve them or request changes.

added CodeOwners label

merged