Drop unused Codex polyfill

We already update the Codex tokens to 1.18.0, no need to have polyfill for them

Author: alistair3149

resources/tokens-codex-polyfill.less

@@ -1,19 +1,3 @@
-/** @since v1.16.0 */
-@background-color-interactive-subtle--hover: @background-color-interactive;
-@background-color-interactive-subtle--active: @border-color-muted;
-@background-color-error-subtle--hover: @background-color-interactive-subtle--hover; // no equivalant in v1.14.0, fallback to old behavior
-@background-color-error-subtle--active: @background-color-interactive-subtle--active; // no equivalant in v1.14.0, fallback to old behavior
-@border-color-interactive--hover: @color-base--hover; // not exactly the same but it is close
-@border-color-interactive--active: @color-base;
-
-/** @since v1.18.0 */
-@background-color-interactive--hover: @border-color-muted;
-@background-color-interactive--active: @border-color-subtle;
-@background-color-progressive-subtle--hover: @background-color-interactive-subtle--hover; // no equivalant in v1.14.0, fallback to old behavior
-@background-color-progressive-subtle--active: @background-color-interactive-subtle--active; // no equivalant in v1.14.0, fallback to old behavior
-@background-color-destructive-subtle--hover: @background-color-interactive-subtle--hover; // no equivalant in v1.14.0, fallback to old behavior
-@background-color-destructive-subtle--active: @background-color-interactive-subtle--active; // no equivalant in v1.14.0, fallback to old behavior
-
 /**
  * filter-invert-icon is used to invert icons for dark mode
  * It was included in Codex Design Tokens but not all skins have included it.