Product Attribute Ampersands fix

[chriszupan]

Description

Fixed Issues (if relevant)

1. 2.2.6 Product Attributes (dropdown/multi-select) issue with ampersands #18263
2. ...

Manual testing scenarios

1. ...
2. ...

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-cicd2]

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[magento-engcom-team]

Hi @chriszupan. Thank you for your contribution
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[slavvka]

Hey @chriszupan. Thank you for your contribution but we already have internal ticket (MAGETWO-94962) which is in progress currently and will be delivered soon. Additionally I would like to pay your attention that your fix isn't reliable. You fix there consequence of the problem whereas the root cause is in places where serialized_options is formed. It is in app/code/Magento/Catalog/view/adminhtml/web/js/options.js and app/code/Magento/Swatches/view/adminhtml/web/js/product-attributes.js. Also there is another class where the same parse of serialized_options takes place in EE code.