Update userpass validations to handle password_hash

[hashishaw]

Userpass has a new way of adding or updating the user's password: password_hash. This PR updates the validation on userpass auth method in the following ways:

• move the validation check to on submit instead of key up, to match how our other forms work
• If editing a user, skip validation and let the API return the error if there is one
• If password AND password_hash are blank on a new user, show the validation message and prevent API request
• If password AND password_hash are present on a new user, show the validation message and prevent API request

• Ent tests pass

[github-actions]

CI Results:
All Go tests succeeded! ✅

[github-actions]

Build Results:
All builds succeeded! ✅

[hellobontempo]

🚢