fix!: refactor warning icon (#7112)

* feat: add basic warning icon

* feat: work on actually using the warning icon

* chore: add docs

* chore: delete old warning icon

* chore: fix build

* chore: my own comments

* chore: move Warning to icons.WarningIcon

* chore: move properties to the module level

* chore: properly override and call super

* chore: properly use optional chaining

* chore: fixup comment typo

* chore: change imports to import type

* chore: reduces changes in block js files

* chore: add renaming

scripts/migration/renamings.json5

@@ -1447,5 +1447,15 @@
 
   'develop': [
     // New renamings go here!
+    {
+      oldName: 'Blockly.Warning',
+      exports: {
+        Warning: {
+          newExport: 'WarningIcon',
+          oldPath: 'Blockly.Warning',
+          newPath: 'Blocky.icons.WarningIcon',
+        },
+      },
+    },
   ],
 }