[stable18] Ensured large image is unloaded from memory when generating previews#22186

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backport/22008/stable18

Commits on Aug 11, 2020

fix memory leak caused by not destroying image in Preview/Generate.php

elijahnyp
authored and
backportbot[bot]
committed
Use class that actually has the destroy() method in preview generator

MorrisJobke
authored and
backportbot[bot]
committed