Fix for issue 39353 validate template vars in customer addr

[rostilos]

Description (*)

Added validation for the presence of template variables in the user address.
In the original ticket it was suggested to sanitize values, but I don't think it's really necessary. I don't think any of the address fields can contain something like {{ .... }}, so it is reasonable to add this to the validation rules.

Related Pull Requests

Fixed Issues (if relevant)

1. Fixes [Address Book Bug] Template filter \Magento\Framework\Filter\Template cannot deal with improper input #39353

Manual testing scenarios (*)

1. When creating or editing an address ( storefront/adminhtml ), enter into any of the address fields a template variable of the following form : {{if city}}{{var city}}, {{/if}}
2. Check if there is a validation error

Questions or comments

Contribution checklist (*)

• Pull request has a meaningful description of its purpose
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• 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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