Fix issue extend match class in style-old admin

[mrtuvn]

Description (*)

This PR aims to clean old styles less in admin . Some extend class not match

Related Pull Requests

Fixed Issues (if relevant)

1. Fixes Less compilation problems in Magento/backend theme #24004

Manual testing scenarios (*)

1. Setup a vanilla Magento installation
2. Run npm install less@3.9.0
3. Run rm -R var/view_preprocessed/* pub/static/*; bin/magento setup:static-content:deploy -f --theme=Magento/backend en_US
4. Run node_modules/.bin/lessc -l var/view_preprocessed/pub/static/adminhtml/Magento/backend/en_US/css/styles-old.less

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)

[m2-assistant]

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[ihor-sviziev]

@magento run all tests

[magento-engcom-team]

Hi @ihor-sviziev, thank you for the review.
ENGCOM-7758 has been created to process this Pull Request

[engcom-Alfa]

✔️ QA Passed

Manual testing scenario:

1. Setup a vanilla Magento installation
2. Run in console: npm install less@3.9.0
3. Run in console: rm -R var/view_preprocessed/* pub/static/*; bin/magento setup:static-content:deploy -f --theme=Magento/backend en_US
4. Run in console: node_modules/.bin/lessc -l var/view_preprocessed/pub/static/adminhtml/Magento/backend/en_US/css/styles-old.less

Before: ✖️ Linting of the styles-old.less file shows the following errors

After: ✔️ Linting of the styles-old.less file doesn't show any errors

[m2-assistant]

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