[User tile] Move NG style in CSS package

[jeremie-lucca]

Description

Move User Tile NG style in SCSS package

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Notes :

• Component UI was updated to fit with Figma (Strings order, font weight...)
• Refacto on classes name to fit with component name (user > userTile)
• Deprecated classes are preserved in case components classes were imported to build custom tiles
• Component's CSS vars are currently duplicated and will be fusioned after avatar/userPicture rework
• userTileStyle mixin is depracated

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