This issue is automatically created based on existing pull request: #39882: Remove legacy compatibility code for PHP versions < 8.1

Description (*)

This pull request removes code that was designed to be ran on PHP <8.1.
Also, removed checks for PHP_VERSION_ID contact availability, since it's available in all PHP versions

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)

  README.md files for modified modules are updated and included in the pull request if any README.md predefined sections require an update

  All automated tests passed successfully (all builds are green)
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