\Magento\Framework\Image\Adapter\Gd2::resize() does not free the previous GD image resource _imageHandler with imagedestroy before creating a new one

[dmitrii-fediuk]

https://mage2.pro/t/295

Similar to #2694, #2696, #2712, #2728

[andimov]

@mage2pro thank you for reporting.
Please fill description according to the template and specify magento version here.

[andimov]

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