Make sure implicit thumbnail in higher priority over the thumbnail source

[moonyuet]

Changelog Description

When users trying to create screengrab thumbnails and publish along with the review product type, it will error out the intgerate.py due to the duplicate of the thumbnail representation data. This PR is to make sure the extract thumbnail is always at the higher priority than the extract thumbnail sources

Additional info

please test on some other hosts with thumbnail extractors in review family, maybe similar bug is hit when you publish both screengrab and review family

ported from ynput/ayon-core#695

Testing notes:

1. Launch Maya/Max
2. Create Review Instance
3. Create Screengrab in publisher tab
4. Publish

• No error should occur.
• The thumbnail set in the publisher UI will be ignored/discarded; instead the thumbnail from Maya's Extract Review will be forcefully used. As such, setting a thumbnail in the publisher UI does nothing for review instances.

[LiborBatek]

Works fine and without any issues...

Tested in maya 2024

LGTM

[LiborBatek]

when testing in blender it works too and no errrors shown and as there is no any sort of nested product inside "review" product all user captured thumbnails stays intact too (besides review which been taken over by implicit one)

All good.

[BigRoy]

@moonyuet could you add to the PR description which of the two thumbnails now take higher priority? Which of the two will be used and which will be discarded? That was a topic for discussion here so it would be great if the PR would clearly state that (and have it confirmed/tested also via the testing notes)

Also tagging @dee-ynput because there was still (as far as I know unanswered 'to be discussed' point here raised here)

[moonyuet]

@moonyuet could you add to the PR description which of the two thumbnails now take higher priority? Which of the two will be used and which will be discarded? That was a topic for discussion here so it would be great if the PR would clearly state that (and have it confirmed/tested also via the testing notes)

Also tagging @dee-ynput because there was still (as far as I know unanswered 'to be discussed' point here raised here)

The extract thumbnail from the host takes higher priority for this PR, not the thumbnail source which takes the screengrab as thumbnail.