[Require SSO] Enterprise policy enforcement (#970)

* Initial commit of require sso authentication policy enforcement

* Updated sproc to send UseSso flag // Updated base validator to send back error message // Added changes to EntityFramework (just so its there for the future

* Update policy name // adjusted conditional to demorgan's

* Updated sproc // Added migrator script

* Added .sql file extension to DeleteOrgUserWithOrg migrator script

* Added policy // edit // strings // validation to business portal

* Change requests from review // Added Owner & Admin exemption

* Updated repository function used to get org user's type

* Updated with requested changes

src/Core/Repositories/EntityFramework/OrganizationRepository.cs

@@ -99,6 +99,7 @@ namespace Bit.Core.Repositories.EntityFramework
                     UseEvents = e.UseEvents,
                     UsersGetPremium = e.UsersGetPremium,
                     Using2fa = e.Use2fa && e.TwoFactorProviders != null,
+                    UseSso = e.UseSso,
                 }).ToListAsync();
             }
         }