Merge branch 'vd/sparse-reset-checkout-fixes' into maint

Fixes to sparse index compatibility work for "reset" and "checkout" commands. source: <pull.1312.v3.git.1659985672.gitgitgadget@gmail.com> * vd/sparse-reset-checkout-fixes: unpack-trees: unpack new trees as sparse directories cache.h: create 'index_name_pos_sparse()' oneway_diff: handle removed sparse directories checkout: fix nested sparse directory diff in sparse index