[Issue] Clean code less vendor prefix appearance

[m2-assistant]

This issue is automatically created based on existing pull request: #31191: Clean code less vendor prefix appearance

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Description (*)

Clean code less prefix apperance. Also clear unneccesary prefix flexbox
Flexbox supported widely in all major browsers so we don't need prefix for flexbox anymore
https://caniuse.com/flexbox

Related Pull Requests

Fixed Issues (if relevant)

1. Fixes magento/magento2#<issue_number>

Manual testing scenarios (*)

1. ...
2. ...

Questions or comments

I have another PR clean code less prefix for flexbox here
#30923

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)

[m2-assistant]

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