15: Convert pagesize properly to skip and take

[Zeegaan]

Fixes #17046

How to test

• Follow steps in original issue
• You can use this code to create 500 members, I personally threw it in a media saving notification just because i had one lying around 😅

        for (int i = 0; i < 550; i++)
        {
            var member = _memberService.CreateMember($"Test{i}", $"test{i}@gmail.com", $"TestName{i}", Constants.Security.DefaultMemberTypeAlias);
            _memberService.Save(member);
        }

using Umbraco.Cms.Core;
using Umbraco.Cms.Core.Composing;
using Umbraco.Cms.Core.Events;
using Umbraco.Cms.Core.Notifications;
using Umbraco.Cms.Core.Services;

public class MyComposer : IComposer
{
    public void Compose(IUmbracoBuilder builder)
    {
        builder.AddNotificationHandler<MediaSavingNotification, MyNotificationHandler>();
    }
}

public class MyNotificationHandler : INotificationHandler<MediaSavingNotification>
{
    private readonly IMemberService _memberService;

    public MyNotificationHandler(IMemberService memberService)
    {
        _memberService = memberService;
    }
    public void Handle(MediaSavingNotification notification)
    {
        for (int i = 0; i < 550; i++)
        {
            var member = _memberService.CreateMember($"Test{i}", $"test{i}@gmail.com", $"TestName{i}", Constants.Security.DefaultMemberTypeAlias);
            _memberService.Save(member);
        }
    }
}

[kjac]

LGTM 💪