SaveAssetsKeywordsInterface to delete obsolete keywords

[sivaschenko]

Story

#724

Description

This change should be done in magento2 repo

The functionality of \Magento\MediaGallery\Model\ResourceModel\Keyword\SaveAssetsKeywords::execute should be update to delete the links to the keywords that are not provided in the argument

Testing

\Magento\MediaGallery\Model\ResourceModel\AssetKeywordsTest integration test should be adjusted to cover this case

[m2-assistant]

Hi @sivaschenko. Thank you for your report.
To help us process this issue please make sure that you provided sufficient information.

Please, add a comment to assign the issue: @magento I am working on this

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[ProkopovVitaliy]

@magento I am working on this

[lenaorobei]

Hi @ProkopovVitaliy. Do you have any progress with this task? If you need an assistance please let us know.