fix: user creation/edition validation

[jmorel]

Signed-off-by: Jérémy Morel jeremy.morel@owkin.com

Linked to this ASANA TASK

Description

Companion PR: Substra/substra-backend#524

• fixes a typo (hasCorrectLenght )
• renames unclear method checkPasswordErrors into isPasswordValid
• fixes the valid status of the PasswordInput component
• displays toast and closes drawer only once the create/update call has returned. This also allows the list to be refreshed only once the creation/update has finished, which makes sure it contains the most up-to-date data
• handles creation failure (error toast + do not close drawer)
• disables create button if form is not valid
• adds a loading status on the create button when the call is ongoing
• disable inputs during update/creation