[MBL-3163] Update PPO dark mode colors and related banner color (#2811)

* Use design system colors instead

* Delete legacy error tag colors

Author: ifosli

KDS/Sources/KDS/Colors/LegacyColors.swift

@@ -211,20 +211,6 @@ public struct LegacyColors {
         darkMode: UIColor(coreColor: .black)
       )
     }
-
-    public struct Error {
-      public static let background = LegacyColor(
-        "legacy/tags/error/background",
-        lightMode: UIColor(coreColor: .red_200),
-        darkMode: UIColor(coreColor: .red_200)
-      )
-
-      public static let foreground = LegacyColor(
-        "legacy/tags/error/foreground",
-        lightMode: UIColor(coreColor: .red_800),
-        darkMode: UIColor(coreColor: .black)
-      )
-    }
   }
 
   public struct Project {

KDS/Sources/KDS/Controllers/ColorsView.swift

@@ -114,8 +114,6 @@ public struct ColorsView: View {
     LegacyColors.Tags.Success.foreground,
     LegacyColors.Tags.Warn.background,
     LegacyColors.Tags.Warn.foreground,
-    LegacyColors.Tags.Error.background,
-    LegacyColors.Tags.Error.foreground,
     LegacyColors.Background.search,
     LegacyColors.Buttons.blue
   ]