V14/feature/management tree count by take zero (#15308)

* Allow Tree endpoints that query entities to return count without entity data

* Apply count by take 0 in FileSystem Endpoints

* Apply count by take 0 in Dictionary Endpoints

* Apply count by take 0 in RootRelationType Endpoints

* Revert PaginationService takeZero flag as it only guards against things that already blow up

* Mark PagedResult as Obsolete as we want to step away from classic pagination system to skip/take

* Pushed management api RelationType pagination and async preperation down to the service layer

* Scope fix and allocation optimizations

* Pushed management api dictionary pagination and down to the service layer

Also did some nice allocation optimizations

* PR feedback + related strange count behaviour

* Moved count by pagesize logic from EntryController to service

* A tiny bit of formatting and comments

* Fix bad count filter logic

* Added integration tests for creating datatypes in a folder

* Added tests for count testing on TreeControllers

- ChildrenDataType
- RootDataType
- ChildrenDictionary
- RootDictionary
- ChildrenDocument
- RootDocument
- RootBluePrint
- RootDocumentType
- ChildrenDocumentType

* Revert "Added tests for count testing on TreeControllers", should be on services

This reverts commit ee2501fe620a584bba13ecd4fdce8142133fd82b.
This reverts commit 808d5b276fad267a645e474ead3278d4bb79d0c4.

---------

Co-authored-by: Sven Geusens <sge@umbraco.dk>
Co-authored-by: kjac <kja@umbraco.dk>
Co-authored-by: Andreas Zerbst <andr317c@live.dk>

src/Umbraco.Infrastructure/Persistence/Repositories/Implement/ExternalLoginRepository.cs

@@ -46,7 +46,7 @@ internal class ExternalLoginRepository : EntityRepositoryBase<int, IIdentityUser
     /// </summary>
     /// <param name="query"></param>
     /// <returns></returns>
-    public int Count(IQuery<IIdentityUserToken> query)
+    public int Count(IQuery<IIdentityUserToken>? query)
     {
         Sql<ISqlContext> sql = Sql().SelectCount().From<ExternalLoginDto>();
         return Database.ExecuteScalar<int>(sql);