[URP] Fixed VFX yflip regression

[thomas-zeng]

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Purpose of this PR

• This PR fixed yflip regression introduced in previous PR Add intermediate texture mode back without changing the old behavior for compatibility purpose. #7077

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Testing status

• ABV

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Comments to reviewers

Notes for the reviewers you have assigned.

[github-actions]

Hi! This comment will help you figure out which jobs to run before merging your PR. The suggestions are dynamic based on what files you have changed.
Link to Yamato: https://unity-ci.cds.internal.unity3d.com/project/902/
Search for your PR branch using the search bar at the top, then add the following segment(s) to the end of the URL (you may need multiple tabs depending on how many packages you change)

URP
/jobDefinition/.yamato%252Fall-urp.yml%2523PR_URP_trunk
With changes to URP packages, you should also run
/jobDefinition/.yamato%2Fall-lightmapping.yml%23PR_Lightmapping_trunk

Depending on the scope of your PR, you may need to run more jobs than what has been suggested. Please speak to your lead or a Graphics SDET (#devs-graphics-automation) if you are unsure.

[thomas-zeng]

VFX is passing with the fix: https://unity-ci.cds.internal.unity3d.com/job/11707007/dependency-graph
Yamato still has me red in postpro tests. I kicked off re-run and I believe failures are not related to the PR change(same failure happens in master couple days ago see: https://unity-ci.cds.internal.unity3d.com/job/11646510).
Still need to look into other failures

[PaulDemeulenaere]

I confirm, this job is 🟢
Thanks for the fix!

[thomas-zeng]

postpro tests and missing doc test are the tests failing. Failures are not related to the PR change as the same failure could be observed in master branch yamato test.