Remove fomantic inverted variations (#25286)

Remove all Fomantic `inverted` variations, we are no using any of them.
This reduces the index CSS bundle by 98kB.

web_src/fomantic/_site/globals/site.variables

@@ -9,3 +9,41 @@
 @linkHoverUnderline: underline;
 @variationButtonSocial: false;
 @pageOverflowX: visible;
+
+/* disable all inverted variations */
+@variationAccordionInverted: false;
+@variationBreadcrumbInverted: false;
+@variationButtonAttached: false;
+@variationButtonInverted: false;
+@variationCalendarInverted: false;
+@variationCardInverted: false;
+@variationCheckboxInverted: false;
+@variationCommentInverted: false;
+@variationDimmerInverted: false;
+@variationDividerInverted: false;
+@variationDropdownInverted: false;
+@variationFeedInverted: false;
+@variationFlyoutInverted: false;
+@variationFormInverted: false;
+@variationGridInverted: false;
+@variationHeaderInverted: false;
+@variationIconInverted: false;
+@variationInputInverted: false;
+@variationItemInverted: false;
+@variationLabelInverted: false;
+@variationListInverted: false;
+@variationMenuInverted: false;
+@variationMessageInverted: false;
+@variationModalInverted: false;
+@variationNagInverted: false;
+@variationPlaceholderInverted: false;
+@variationPopupInverted: false;
+@variationProgressInverted: false;
+@variationSegmentInverted: false;
+@variationSliderInverted: false;
+@variationStatisticInverted: false;
+@variationStepInverted: false;
+@variationTableInverted: false;
+@variationTextInverted: false;
+@variationToastInverted: false;
+@variationTransitionInverted: false;