Merge branch 'ac/deglobal-sparse-variables' into seen

Two global variables related to sparse checkout have been moved to
the repository settings structure.

* ac/deglobal-sparse-variables:
  environment: remove the global variable 'sparse_expect_files_outside_of_patterns'
  environment: move access to "core.sparsecheckoutcone" into repo_settings
  environment: move access to "core.sparsecheckout" into repo_settings

diff --cc builtin/backfill.c
Simple merge

diff --cc builtin/clone.c
Simple merge

diff --cc builtin/grep.c
Simple merge

diff --cc builtin/worktree.c
Simple merge

diff --cc config.c
Simple merge

diff --cc dir.c
Simple merge

diff --cc environment.c
Simple merge

diff --cc environment.h
Simple merge

diff --cc repo-settings.c
Simple merge

diff --cc repo-settings.h
Simple merge

diff --cc unpack-trees.c
Simple merge