[Backport] Remove PDF files after generation

[vasilii-b]

Description

Upon invoice/packingslip/credit memo printing the system generates a PDF file directly in the var directory. I see no reason for keeping these files since they are not accessible publicly via web (sharing purpose). There's no "reuse" purpose as well since on every print action a new file with a new filename is being generated.
This PR provides a logic for removing a PDF file once it's generated.
Currently, it's implemented only within a scope of the invoice printing. Once we agree on the solution, I will adjust other places with PDF generation.

Original PR #16401

Fixed Issues (if relevant)

1. Print pdf don't delete file in var folder #3535
2. PDF invoices in /var folder #14517

Manual testing scenarios

• Open an existing invoice in the admin panel.
• Click the "Print" button.
• You should have the invoice downloaded.
• You should not have a generated PDF file in the var directory.

[magento-engcom-team]

Hi @sidolov, thank you for the review.
ENGCOM-2738 has been created to process this Pull Request

[sidolov]

Hi @vasilii-b , please, fix integration tests issues

[sidolov]

Hi @vasilii-b , I am closing this PR now due to inactivity.
Please reopen and update if you wish to continue.
Thank you for the collaboration!