MM-63950 replace --denim- variables (#30925)

webapp/channels/.stylelintrc.json

@@ -23,6 +23,19 @@
                 "ignore": ["comments"]
             }
         ],
+        "declaration-property-value-disallowed-list": [
+            {
+                "color": ["/--denim-button-bg/"],
+                "background-color": ["/--denim-button-bg/"],
+                "border-color": ["/--denim-button-bg/"],
+                "background": ["/--denim-button-bg/"],
+                "border": ["/--denim-button-bg/"],
+                "fill": ["/--denim-button-bg/"]
+            },
+            {
+                "message": "The --denim-button-bg and --denim-button-bg-rgb variables are deprecated. Please use --button-bg or --button-bg-rgb instead."
+            }
+        ],
         "scss/load-no-partial-leading-underscore": null,
         "scss/at-extend-no-missing-placeholder": null
     }