repository: move 'repository_format_worktree_config' to repo scope

Move 'repository_format_worktree_config' out of the global scope and into
the 'repository' struct. This change is similar to how
'repository_format_partial_clone' was moved in ebaf3bcf1ae (repository: move
global r_f_p_c to repo struct, 2021-06-17), adding it to the 'repository'
struct and updating 'setup.c' & 'repository.c' functions to assign the value
appropriately.

The primary goal of this change is to be able to load the worktree config of
a submodule depending on whether that submodule - not its superproject - has
'extensions.worktreeConfig' enabled. To ensure 'do_git_config_sequence()'
has access to the newly repo-scoped configuration, add a 'struct repository'
argument to 'do_git_config_sequence()' and pass it the 'repo' value from
'config_with_options()'.

Finally, add/update tests in 't3007-ls-files-recurse-submodules.sh' to
verify 'extensions.worktreeConfig' is read an used independently by
superprojects and submodules.

Signed-off-by: Victoria Dye <vdye@github.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/worktree.c b/worktree.c
index b5ee71c..c448fec 100644
--- a/worktree.c
+++ b/worktree.c
@@ -806,7 +806,7 @@ int init_worktree_config(struct repository *r)
 	 * If the extension is already enabled, then we can skip the
 	 * upgrade process.
 	 */
-	if (repository_format_worktree_config)
+	if (r->repository_format_worktree_config)
 		return 0;
 	if ((res = git_config_set_gently("extensions.worktreeConfig", "true")))
 		return error(_("failed to set extensions.worktreeConfig setting"));
@@ -846,7 +846,7 @@ int init_worktree_config(struct repository *r)
 	 * Ensure that we use worktree config for the remaining lifetime
 	 * of the current process.
 	 */
-	repository_format_worktree_config = 1;
+	r->repository_format_worktree_config = 1;
 
 cleanup:
 	git_configset_clear(&cs);