contrib: remove "git-new-workdir"

The "git-new-workdir" command has been introduced to make it possible to
have a separate working directory in a different place. The command thus
predates git-worktree(1), which is what people use nowadays to create
any such working directory. As such, the script doesn't really have much
of a reason to exist nowadays anymore.

It also doesn't seem like the script is still in use: the last time it
has received an update was in e32afab (git-new-workdir: don't fail
if the target directory is empty, 2014-11-26), more than a decade ago.
Remove it as well as the tests that depend on it.

Signed-off-by: Patrick Steinhardt <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: pks-t

contrib/workdir/.gitattributes

@@ -178,7 +178,6 @@ integration_tests = [
   't1015-read-index-unmerged.sh',
   't1016-compatObjectFormat.sh',
   't1020-subdirectory.sh',
-  't1021-rerere-in-workdir.sh',
   't1022-read-tree-partial-clone.sh',
   't1050-large.sh',
   't1051-large-conversion.sh',

contrib/workdir/git-new-workdir

@@ -73,25 +73,6 @@ test_expect_success 'ls-files --others handles non-submodule .git' '
 	test_cmp expected1 output
 '
 
-test_expect_success SYMLINKS 'ls-files --others with symlinked submodule' '
-	git init super &&
-	git init sub &&
-	(
-		cd sub &&
-		>a &&
-		git add a &&
-		git commit -m sub &&
-		git pack-refs --all
-	) &&
-	(
-		cd super &&
-		"$SHELL_PATH" "$TEST_DIRECTORY/../contrib/workdir/git-new-workdir" ../sub sub &&
-		git ls-files --others --exclude-standard >../actual
-	) &&
-	echo sub/ >expect &&
-	test_cmp expect actual
-'
-
 test_expect_success 'setup nested pathspec search' '
 	test_create_repo nested &&
 	(