devtool: do not call ensure_ci_artifacts in cmd_sh

This already caused a recursive call between ensure_ci_artifacts and
cmd_sh (since the former calls the later), which was only benign because
ensure_ci_artifacts exits early if the directory exists. With the next
patch, it will use cmd_sh before creating the directory, so break this
recursion once and for all by instead making the call-sites of cmd_sh
that require artifacts to just ensure them themselves.

Signed-off-by: Patrick Roy <roypat@amazon.co.uk>

Author: roypat

tools/devtool

@@ -878,7 +878,6 @@ cmd_shell() {
 
 cmd_sh() {
     ensure_build_dir
-    ensure_ci_artifacts
     run_devctr \
         --privileged \
         --ulimit nofile=4096:4096 \
@@ -916,6 +915,7 @@ cmd_sandbox_native() {
 }
 
 cmd_test_debug() {
+    ensure_ci_artifacts
     cmd_sh "tmux new ./tools/test.sh --pdb $@"
 }