[Backport] Fixed product tier pricing pagination issue in admin

[dmytro-ch]

Original PR: #15360

Description:

Resolved product tier price pagination loader issue in admin.
The issue was reproduced in Magento 2.2-develop branch.

Fixed Issues

1. Advanced pricing pagination issue #15210: Advanced pricing pagination issue

Manual testing scenarios

Navigate Admin => Catalog => Products => Create New / Edit Product.

1. Go to Advanced Pricing link under Price text field.
2. Add tier price more than a page and do save.
3. Jump to other pages by directly editing the pagination text box.

Contribution checklist

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• All automated tests passed successfully (all builds on Travis CI are green)

[magento-cicd2]

All committers have signed the CLA.

[magento-engcom-team]

Hi @dmytro-ch. Thank you for your contribution.
Changes from your Pull Request will be available with the upcoming 2.2.6 release.

Please, consider to port this solution to 2.3 release line.
You may use Porting tool to port commits automatically.