Review SCSS refactoring for to-be-deprecated Bourbon functions (#1959)

* [Frontend] Refactor SCSS to remove deprecated @includes

Fixes #1891
- In progress

* [Frontend] Refactor SCSS to remove deprecated @includes

Fixes #1891
Making bourbon happy by refactoring to-be-deprecated
calls to prefixing @includes:
- transform and related CSS;
- flex and related CSS;
- Fixed double semi-colons to single;

platform/commonUI/general/res/sass/_object-label.scss

@@ -22,8 +22,8 @@
 
 // mct-representation surrounding an object-label key="'label'"
 .rep-object-label {
-    @include flex-direction(row);
-    @include flex(1 1 auto);
+    flex-direction: row;
+    flex: 1 1 auto;
     height: inherit;
     line-height: inherit;
     min-width: 0;