tests(tar) add and update symlink test files

tests/integration/archive/tar/__input__/symlinks.tar:

test/
|-- bin
|   `-- busybox
`-- sbin
    |-- cp -> /test/bin/busybox
    |-- find -> ../bin/../bin/busybox
    |-- ln -> /test/bin/../bin/busybox
    |-- ls -> ../bin/busybox
    |-- mv -> ../../bin/busybox
    `-- rm -> ../../../bin/busybox

is extracted as

tests/integration/archive/tar/__output__/symlinks.tar_extract/
└── test
    ├── bin
    │   └── busybox
    └── sbin
        ├── cp -> ../bin/busybox
        ├── find -> ../bin/busybox
        ├── ln -> ../bin/busybox
        ├── ls -> ../bin/busybox
        └── mv -> ../../bin/busybox

Please note, that `rm` is missing, as that is a path traversal attempt.

----

The symlinks.tar test file is created with this script in a docker container:

rm -rf /test symlinks.tar

mkdir -p /test/bin
echo binary > /test/bin/busybox
mkdir -p /test/sbin
ln -s ../bin/busybox /test/sbin/ls
ln -s ../bin/../bin/busybox /test/sbin/find
ln -s ../../bin/busybox /test/sbin/mv
ln -s ../../../bin/busybox /test/sbin/rm
ln -s /test/bin/busybox /test/sbin/cp
ln -s /test/bin/../bin/busybox /test/sbin/ln

tar cPf /symlinks.tar /test/
tar tvPf /symlinks.tar

Author: e3krisztian

tests/integration/archive/tar/__input__/symlinks.tar

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:152c7a03b3b3276f8a7527bfde01f26b0c4f2ae3f705a6deac0183d8bac2ba1c
+size 10240

tests/integration/archive/tar/__output__/symlinks.tar_extract/test/bin/busybox

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:58eaf5a78d580f5dbd49d31a5b733094169b31bfdf49055b74bcac2877d8f58c
+size 7

tests/integration/archive/tar/__output__/symlinks.tar_extract/test/sbin/cp

@@ -0,0 +1 @@
+../bin/busybox

tests/integration/archive/tar/__output__/symlinks.tar_extract/test/sbin/find

@@ -0,0 +1 @@
+../bin/busybox

tests/integration/archive/tar/__output__/symlinks.tar_extract/test/sbin/ln

@@ -0,0 +1 @@
+../bin/busybox

tests/integration/archive/tar/__output__/symlinks.tar_extract/test/sbin/ls

@@ -0,0 +1 @@
+../bin/busybox

tests/integration/archive/tar/__output__/symlinks.tar_extract/test/sbin/mv

@@ -0,0 +1 @@
+../../bin/busybox