message: fix(Table): correct right border visibility when stickied
diff: --header-bg: #{color(utility, light)};
  --header-text-color: #{color(pure, dark)};
  --border-color: #{color(utility, light)};
  + --header-border-color: #{color(utility)};
  $primary: color(primary);
  --drop-bg: #{desaturate(lighten($primary, 66%), 70%)};
  // NOTE: This must be above 40 as that is the number of header cell z-indexes set
  // Header cell
  .ts-header-cell {
  background-color: var(--header-bg);
  - border-bottom: 1px solid color(utility);
  + border-bottom: 1px solid var(--header-border-color);
  border-top: none;
  padding: spacing(default);
  position: sticky;
  border-left: 1px solid color(utility);
  }
  + &.ts-table--sticky {
  + border-right: 1px solid var(--header-border-color);
  + }
  +
  // Reverse the natural z-index order so that all borders on the right created with box-shadow are visible above the following cell.
  // Supports up to 40 columns
  $possible-columns: 40;
  