Provider qa feedback (#1501)

* Title case buttons

* Throw if provider tries to add a non-business organization

* Allow only one admin OR owner roll in a free org per user

Boolean operators were not properly assocated
and ownership of an org was precluding confirmation into any other
organization

* Limit email length

* Require email domain with top level domain

* Do not allow email domains to end in invalid characters

* Fix free org tests

src/Core/Models/Api/Request/Providers/ProviderOrganizationCreateRequestModel.cs

@@ -6,6 +6,7 @@ namespace Bit.Core.Models.Api.Request
     public class ProviderOrganizationCreateRequestModel
     {
         [Required]
+        [StringLength(256)]
         [StrictEmailAddress]
         public string ClientOwnerEmail { get; set; }
         [Required]