Reduce TierPriceManagement class complexity by quick refactor

[lbajsarowicz]

Description (*)

I had to debug the issue of removing Tier price. I found the class complex and code style rather poor.
That is why I extracted some repeated code to separate private methods with singular responsibility and explicit types.

Related Pull Requests

Fixed Issues (if relevant)

1. Fixes magento/magento2#<issue_number>

Manual testing scenarios (*)

1. ...
2. ...

Questions or comments

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 are green)

Resolved issues:

1. resolves [Issue] Reduce TierPriceManagement class complexity by quick refactor #29477: Reduce TierPriceManagement class complexity by quick refactor

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[VladimirZaets]

@magento create issue

[magento-engcom-team]

Hi @VladimirZaets, thank you for the review.
ENGCOM-7993 has been created to process this Pull Request
✳️ @VladimirZaets, could you please add one of the following labels to the Pull Request?

Label	Description
Auto-Tests: Covered	All changes in Pull Request is covered by auto-tests
Auto-Tests: Not Covered	Changes in Pull Request requires coverage by auto-tests
Auto-Tests: Not Required	Changes in Pull Request does not require coverage by auto-tests

[engcom-Alfa]

✔️ QA Passed

The Tier Price functionality still works as previously (expected).
Checked Get, Post and Delete

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