Login: Add an option to choose an authentication method (by username/password or token)

Closed Franck Bret requested to merge generated-differential-D8909-source into master

Manage token based authentication Ensure consistency of click styles Fix "AttributeError: module 'click' has no attribute 'exit'" issue when submitting bad login credentials. Adapt dash imports to remove deprecated warnings

Related #4590

Migrated from D8909 (view on Phabricator)

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