The function we were using to run shell commands during the
`sentry:publish` script were swallowing the CLI output. We also weren't
correctly detecting the process exit in some cases.
The `run-command` module originally written for `auto-changelog`
(introduced in #10782 and replaced in #10993) has been resurrected for
running commands where we don't care about the output, or where we want
to use the output for something. A second function (`runInShell`) has
been added for running commands with the same STDOUT and STDERR
streams, so that the output is sent directly to the CLI. This ensures
that the console output from the shell script we run gets correctly
output to the CLI.
