test(cli): add pack-dts-no-warnings snap-test for DTS warning regression

Author: kazupon

packages/cli/snap-tests/pack-dts-no-warnings/package.json

@@ -0,0 +1,5 @@
+{
+  "name": "pack-dts-no-warnings",
+  "version": "1.0.0",
+  "type": "module"
+}