Refer to devcontainer.js rather than devcontainer.cmd.js (#48387)
KyleBarton
created
Closes #46947
When installed with `npm install -g`, devcontainer gets created as
`devcontainer.cmd`. However, when invoked as a script from node, it's
still `devcontainer.js`. This addresses that difference so that we don't
accidentally invoke `devcontainer.cmd.js`.
Release Notes:
- Fixed devcontainer operation on Windows for when the devcontainer cli
is not installed globally