Update VFX after linear gradient changes + add missing meta

[julienf-unity]

Purpose of this PR

• Update VFX after linear gradient PR
• Add missing metas

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Testing status

Manual Tests: What did you do?

• Opened test project + Run graphic tests locally
• Built a player
• Checked new UI names with UX convention
• Tested UI multi-edition + Undo/Redo + Prefab overrides + Alignment in Preset
• C# and shader warnings (supress shader cache to see them)
• Checked new resources path for the reloader (in developer mode, you have a button at end of resources that check the paths)
• Other:

Automated Tests: What did you setup? (Add a screenshot or the reference image of the test please)

Yamato: (Select your branch):
https://yamato.prd.cds.internal.unity3d.com/jobs/902-Graphics

Any test projects to go with this to help reviewers?

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Comments to reviewers

Notes for the reviewers you have assigned.