Issue #3383452: Replace Claro CSS variables used in Field UI

There's a claro variable still being used in field_ui_add_field.theme.css. Could that be updated too?

added 1 commit

• a19f7e67 - replace remaining usage claro variables

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added 16 commits

• a19f7e67...8e42cef1 - 14 commits from branch project:11.x
• c3bf7b44 - replaced with claro variables with local variables
• e1063ba8 - replace remaining usage claro variables

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