Feature add ifconfig to reference containers and blocks

[Sam-Mear]

Description (*)

Adds the optional attribute ifconfig. works the same as the same attribute wit hthe same name on other types of elements in view xml.

Related Pull Requests

Fixed Issues (if relevant)

1. Fixes Add support for ifconfig to referenceBlock #31337

Manual testing scenarios (*)

1. Use the attribute in view xml, similarly to the ttests found at dev/tests/integration/testsuite/Magento/Framework/View/LayoutTest.php

Questions or comments

Contribution checklist (*)

• [x ] Pull request has a meaningful description of its purpose
• [ x] All commits are accompanied by meaningful commit messages
• [x ] 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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[Sam-Mear]

@magento run all tests