[sparkle] - chore: ditch z-index classes #10212
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Description
This PR aims at ditching all existing z-indexes on sparkle components and to add a linting rule to prevent from adding new ones.
As we are not doing anything extremely fancy for now there should be no need to use z-indexes. Also, adding z-indexes conflicts with indexes from Radix.
Risk
Quite important blast radius UX wise
Deploy Plan