Mark Backend Blocks as API

[sivaschenko]

The following Blocks should be marked as API in 2.5-develop branch

1. Magento\Backend\Block\Menu
2. Magento\Backend\Block\GlobalSearch
3. Magento\Backend\Block\Page
4. Magento\Backend\Block\Template
5. Magento\Backend\Block\Denied
6. Magento\Backend\Block\Page\Header
7. Magento\Backend\Block\Page\Notices
8. Magento\Backend\Block\Page\RequireJs
9. Magento\Backend\Block\Page\Footer
10. Magento\Backend\Block\Widget\Tabs
11. Magento\Backend\Block\Widget\Tab
12. Magento\Backend\Block\Widget\Button
13. Magento\Backend\Block\Widget\Breadcrumbs
14. Magento\Backend\Block\Widget\Container
15. Magento\Backend\Block\Widget\Form\Renderer\Fieldset
16. Magento\Backend\Block\Store\Switcher
17. Magento\Backend\Block\Cache\Additional

[m2-assistant]

Hi @sivaschenko. Thank you for your report.
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[Usik2203]

@magento I am working on this

[Usik2203]

Hi @sivaschenko
I see that all these blocks already marked as API
Thanks