[Backport] Admin tabs order not working properly

[mageprince]

Original Pull Request

#16412

• Created a method to reorder the tabs which is less complex and works better.

Description

When you add 2 or more tabs to admin area, like order view page, by using the method addTabAfter and the second new tab is placed after the first new tab the sort order does not work as expected.

More details in the issue.

Fixed Issues

1. Admin tabs order not working properly #16174: Issue title

Manual testing scenarios

Described in the issue.

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 on Travis CI are green)

[magento-engcom-team]

Hi @mageprince. Thank you for your contribution
Here is some useful tips how you can test your changes using Magento test environment.
Add the comment under your pull request to deploy test or vanilla Magento instance:

• @magento-engcom-team give me test instance - deploy test instance based on PR changes
• @magento-engcom-team give me {$VERSION} instance - deploy vanilla Magento instance

For more details, please, review the Magento Contributor Assistant documentation

[sidolov]

@mageprince , this changes already delivered in the scope of another pull request: #16175
I'm closing this one as not relevant.