Allow to convert users to Group Managed Accounts

What does this MR do?

This allow to logged in users when using SAML groups SSO /groups/:group_name/-/saml/sso, if their SAML data matches with one of its verified emails to convert/transfer its account to managed groups

Adds the feature flag convert_user_to_group_managed_accounts.

Screenshots

Screenshot_2020-02-05_at_15.47.15

Screenshot_2020-02-14_at_15.50.56

Screenshot_2020-02-14_at_15.51.36

Does this MR meet the acceptance criteria?

Conformity

Availability and Testing

Security

If this MR contains changes to processing or storing of credentials or tokens, authorization and authentication methods and other items described in the security review guidelines:

  • Label as security and @ mention @gitlab-com/gl-security/appsec
  • The MR includes necessary changes to maintain consistency between UI, API, email, or other methods
  • Security reports checked/validated by a reviewer from the AppSec team

Related #13481 (closed)

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