[Forwardport] Prevent not category links in breadcrumbs at product page #14994

[vovayatsyuk]

It's a cherry-pick of #14994

Description

Magento 2.2.4 only.
When a product is opened from a homepage and menu has a link to the homepage,
two home links will be inserted into breadcrumbs.

Update: Added the case with "Contacts" link in the navigation.

Manual testing scenarios

1. Open app/code/Magento/Theme/view/frontend/templates/html/topmenu.phtml
2. Insert the following code:

<li class="level0 level-top" role="presentation">
    <a href="<?php echo $block->getUrl() ?>" class="level-top" tabindex="-1" role="menuitem"><span>Home</span></a>
</li>
<li class="level0 level-top" role="presentation">
    <a href="<?php echo $block->getUrl('contact') ?>" class="level-top" tabindex="-1" role="menuitem"><span>Contacts</span></a>
</li>

Right before

<?= /* @escapeNotVerified */ $_menu ?>

3. Open homepage or contacts page
4. Click on any product to navigate to its page (It may be a product in cart)
5. Breadcrumbs will have two "Home" links, or Contacts page will be added into breadcrumbs.

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 @vovayatsyuk. Thank you for your contribution.
Changes from your Pull Request will be available with the upcoming 2.3.0 release.