`emb` CLI calls fail after `./setup_env.sh`

[kerberjg]

Running emb flutter ... + ./setup_env.sh breaks the emb_cli installation.

Running emb bundle (or any command for that matter) fails with:

No active package emb_cli.

[kerberjg]

cc @jwinarske

[jwinarske]

@kerberjg Start here: https://github.com/toyota-connected/emb_cli/blob/main/training