Move zstdgrep and zstdless tests to cli-tests (#3057)

* Move zstdgrep and zstdless tests to cli-tests

Co-authored-by: Binh Vo <binhvo@fb.com>

tests/cli-tests/cltools/zstdless.sh

@@ -0,0 +1,10 @@
+#!/bin/sh
+
+set -e
+
+println "+ good path"
+zstdless file.zst
+println "+ pass parameters"
+zstdless -N file.zst # This parameter does not produce line #s when piped, but still serves to test that the flag went to less and not zstd
+println "+ bad path"
+zstdless bad.zst