feat(gs/emacs): Add haskell test-group snippet

For tasty testGroups

Change-Id: I855ceed68e575eec48f236608015f8d40416e332
Reviewed-on: https://cl.tvl.fyi/c/depot/+/3209
Reviewed-by: grfn <grfn@gws.fyi>
Tested-by: BuildkiteCI

users/grfn/emacs.d/snippets/haskell-mode/test-group

@@ -0,0 +1,9 @@
+# -*- mode: snippet -*-
+# name: test-group
+# uuid:
+# key: testGroup
+# condition: t
+# --
+testGroup "${1:name}"
+[ $0
+]