[PM-17777] sponsorships consume seats (#5694)

* Admin initiated sponsorships now use seats similarly to inviting an organization user

* Updated f4e endpoint to not expect a user ID, and instead just send a boolean

* Fixed failing tests

* Updated OrganizationUserReadOccupiedSeatCountByOrganizationIdQuery to ensure both left and right sides are selecting the same columns

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

@@ -5,10 +5,19 @@ BEGIN
     SET NOCOUNT ON
     
     SELECT
-        COUNT(1)
-    FROM
-        [dbo].[OrganizationUserView]
-    WHERE
-        OrganizationId = @OrganizationId
-        AND Status >= 0 --Invited
+        (
+            -- Count organization users
+            SELECT COUNT(1)
+            FROM [dbo].[OrganizationUserView]
+            WHERE OrganizationId = @OrganizationId
+            AND Status >= 0 --Invited
+        ) + 
+        (
+            -- Count admin-initiated sponsorships towards the seat count
+            -- Introduced in https://bitwarden.atlassian.net/browse/PM-17772
+            SELECT COUNT(1)
+            FROM [dbo].[OrganizationSponsorship]
+            WHERE SponsoringOrganizationId = @OrganizationId
+            AND IsAdminInitiated = 1
+        )
 END