[EC-635] Extract organizationService.UpdateLicenseAsync to a command (#2408)

* move UpdateLicenseAsync from service to command
* create new SelfHostedOrganizationDetails view model and move license validation logic there
* move occupied seat count logic to database level

src/Sql/dbo/Stored Procedures/Group_ReadCountByOrganizationId.sql

@@ -0,0 +1,13 @@
+CREATE PROCEDURE [dbo].[Group_ReadCountByOrganizationId]
+    @OrganizationId UNIQUEIDENTIFIER
+AS
+BEGIN
+    SET NOCOUNT ON
+
+    SELECT
+        COUNT(1)
+    FROM
+        [dbo].[Group]
+    WHERE
+        [OrganizationId] = @OrganizationId
+END