[BUG] Need special deal with azure subscription name if it has slash

[sunshine69]

Describe the bug
If you subscription name has a slash and even you set it in your service principal yaml epicli will fail at terraform stage.

The problems coming from Azure API itlself, while it allows to use slash / in the subscription name however the endpoint URI will not respect that. PLease see the comment in the PR for more information.

PR included (or a suggestion of the fix)

#2000

What I found is that even I use the subscription ID in the sp.yaml in epiphany after load the yaml it converts it back to the subscription name. So add the logic if the name has / then we set the TF env var to use the ID.

This PR has been working in my test which fix out issue.

[seriva]

Closing as per comment left on discussion for #2000.