Use thumbnail as image url image_view if available

[sahil-R]

Fixes

Fixes WordPress/openverse#675 by @stacimc

Description

Some providers can link large images in their image_url, This can cause unacceptably slow response times or even timeouts when generating thumbnails via our thumbnail service.

This pr tries to tackle this by checking if there is a thumbnail URL available or not, if yes, then it uses the thumbnail URL; if not, only then it uses the image URL.

Testing Instructions

Checklist

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  Update index.md).
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[dhruvkb]

Thanks @sahil-R! The logic is sound but the code quality can be improved in some ways.

[dhruvkb]

The comment can use some punctuation and grammar improvements but other than that, LGTM!

[sarayourfriend]

LGTM, thank you for the contribution and quick changes @sahil-R.

Requesting to add unit tests

[sarayourfriend]

I approved, but prematurely. If you can please add unit tests for this change, then it will be able to be approved and merged without issue. The new tests would need to be added in media_views_test.py, however it will conflict with changes in #1056 which will make adding those new tests significantly easier as it cleans up the tedious fixtures currently present in that test module. If you'd like to wait for the Photon PR to be merged to make it simpler to add the tests, feel free. Otherwise, please note that there may be conflicts if the other PR is merged first.

[openverse-bot]

Based on the medium urgency of this PR, the following reviewers are being gently reminded to review this PR:

@obulat
This reminder is being automatically generated due to the urgency configuration.

Excluding weekend¹ days, this PR was updated 4 day(s) ago. PRs labelled with medium urgency are expected to be reviewed within 4 weekday(s)².

@sahil-R, if this PR is not ready for a review, please draft it to prevent reviewers from getting further unnecessary pings.

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[krysal]

Ups, I made the test based on the old ones, before noticing the conflict. I'll get back to this later if @sahil-R doesn't get to it firsts.