Add new flexbox mixins

[mrtuvn]

Description (*)

This Pr is only improvement add some new flexbox mixins for reuse while developments
So FE devs can reuse it while modify or customise themes

Example when in less arrange layout
we can use .lib-flex-center(); for get flexbox basic styles instead write multiple line like before

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] Add new flexbox mixins #30669: Add new flexbox mixins

[m2-assistant]

Hi @mrtuvn. Thank you for your contribution
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[sidolov]

@magento create issue

[mrtuvn]

Can we have new proceed on this
This no need require automated tests
@krzksz @Leland can you review this

[mrtuvn]

Can we have proceed on this

[mrtuvn]

@magento run Static Tests

[mrtuvn]

@magento run all tests

[mrtuvn]

Rebased PR branch with mainline magento code branch

[mrtuvn]

@magento run all tests

[mrtuvn]

@magento run Magento Health Index

[magento-engcom-team]

Hi @ihor-sviziev, thank you for the review.
ENGCOM-8619 has been created to process this Pull Request
✳️ @ihor-sviziev, 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

[magento-automated-testing]

The requested builds are added to the queue. You should be able to see them here within a few minutes. Please re-request them if they don't show in a reasonable amount of time.

[mrtuvn]

@magento run all tests

[magento-automated-testing]

The requested builds are added to the queue. You should be able to see them here within a few minutes. Please re-request them if they don't show in a reasonable amount of time.

[mrtuvn]

@magento run
Functional Tests EE,
Functional Tests CE

[magento-automated-testing]

The requested builds are added to the queue. You should be able to see them here within a few minutes. Please re-request them if they don't show in a reasonable amount of time.

[ihor-sviziev]

@magento run Functional Tests CE

[magento-automated-testing]

The requested builds are added to the queue. You should be able to see them here within a few minutes. Please re-request them if they don't show in a reasonable amount of time.

[engcom-Bravo]

Hi @mrtuvn,

We are closing this PR.The PR is in Draft since longtime.

Once you are ready Please feel free to reopen it to process the PR further.

Thanks