Fix: Login with email and add option to disable some external auth provider

[Bilelkihal]

Done in this PR:

• Fix login using email (it was not working before)
  Before there was only login using username, what I'm doing is to check if the input is an email, if yes I get the username of the user based on the email and then do the login using the username.

• Make orcid and Keycloak sso diasbled in login page
  To show that they work but not configured, I achieved that by adding a new key to the config file which is enable, and the new $OMNIAUTH_PROVIDERS is:

$OMNIAUTH_PROVIDERS = {
  github: {
    client_id: 'CLIENT_ID',
    client_secret: 'CLIENT_SECRET',
    icon: 'github.svg',
    enable: true
  },
  google: {
    strategy: :google_oauth2,
    client_id: 'CLIENT_ID',
    client_secret: 'CLIENT_SECRET',
    icon: 'google.svg',
    enable: true
  },
  orcid: {
    client_id: 'CLIENT_SECRET',
    client_secret: 'CLIENT_SECRET',
    icon: 'orcid.svg',
    enable: false
  },
  keycloak: {
    strategy: :keycloak_openid,
    client_id: 'YOUR_KEYCLOAK_CLIENT_ID',
    client_secret: 'YOUR_KEYCLOAK_CLIENT_SECRET',
    client_options: { site: 'KEYCLOAK_SITE', realm: 'KEYCLOAK_REALM' },
    name: 'keycloak',
    icon: 'keycloak.svg',
    enable: false
  }
}.freeze 

[syphax-bouazzouni]

when we hover over the button, the disabled ones, need to show a tooltip to tell that they are disabled, using the tooltip component,see example https://stageportal.lirmm.fr/lookbook/inspect/display/info_tooltip/default

[Bilelkihal]

Done

[syphax-bouazzouni]

seems the test don't pass, you need to update the .sample file with your changes in configuration

[syphax-bouazzouni]

You will need to update the config here https://github.com/ontoportal-lirmm/ontoportal-configs also @Bilelkihal

[Bilelkihal]

@syphax-bouazzouni
I need access

[syphax-bouazzouni]

Done @Bilelkihal