Allow dashes in saltenv names

[BigBadBassMan]

This allows for dashes in saltenv names (e.g. when importing git-branch-backed salt environments like jira-12345-feature-xyz). (as discussed here: https://community.theforeman.org/t/salt-state-import-fails-on-3-10-el9-due-to-salt-state-names-being-considered-invalid-for-activerecord/37592/11)

Such environment names are already supported by salt itself, so not being able to use them from foreman is a huge inconvenience.

(Edit: salt even supports forward slashes in environment names, like in git prefixes "feature/xy" or "pr/abc-def", but that leads to other problems, namely that foreman tries to treat the env-name as an URL part, when syncing, which fails due to the unescaped slash... so not included here, but technically possible)

Please also backport this change to Foreman 3.10.

[nadjaheitmann]

LGTM

[nadjaheitmann]

Thanks @BigBadBassMan