[PM-17823]Add feature toggle for admin sponsored families to admin portal (#5595)

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* Add `Notes` column to `OrganizationSponsorships` table

* Add feature flag to `CreateAdminInitiatedSponsorshipHandler`

* Unit tests for `CreateSponsorshipHandler`

* More tests for `CreateSponsorshipHandler`

* Forgot to add `Notes` column to `OrganizationSponsorships` table in the migration script

* `CreateAdminInitiatedSponsorshipHandler` unit tests

* Fix `CreateSponsorshipCommandTests`

* Encrypt the notes field

* Wrong business logic checking for invalid permissions.

* Wrong business logic checking for invalid permissions.

* Remove design patterns

* duplicate definition in Constants.cs

* Add the admin sponsored families to admin portal

* Add a feature flag

* Rename the migration file name

* Resolve the existing conflict and remove added file

* Add a migration for the change

* Remove the migration Because is already added

* Resolve the failing migration

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Co-authored-by: Jonas Hendrickx <jhendrickx@bitwarden.com>

src/Admin/AdminConsole/Controllers/OrganizationsController.cs

@@ -462,6 +462,7 @@ public class OrganizationsController : Controller
             organization.UsersGetPremium = model.UsersGetPremium;
             organization.UseSecretsManager = model.UseSecretsManager;
             organization.UseRiskInsights = model.UseRiskInsights;
+            organization.UseAdminSponsoredFamilies = model.UseAdminSponsoredFamilies;
 
             //secrets
             organization.SmSeats = model.SmSeats;