Agniva De Sarker 279c448da3 MM-36295: Do not convert thumbnails/previews to jpeg for png images (#21230) ...

We were applying a white background to transparent images
and converting them to jpegs. This was to make text be legible
behind a black preview background.

However, this has led to a poor user experience, as users rarely
download the full image but always click on previews. Therefore,
we need the previews to remain as pngs.

To fix this, we just re-encode them as pngs instead of jpgs.

```release-note
NONE
```

2022-10-11 19:04:09 +05:30

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Исходник История