chore: Remove mostly everything.

The decision has been made to set up ARIA directly in core Blockly on a
specific long-lived experimental branch.

Author: BenHenning

src/index.ts

@@ -296,7 +296,7 @@ export class KeyboardNavigation {
     stroke: var(--blockly-active-node-color);
     stroke-width: var(--blockly-selection-width);
   }
-
+  
   /* The workspace itself is the active node. */
   .blocklyKeyboardNavigation
     .blocklyBubble.blocklyActiveFocus

src/navigation_controller.ts

@@ -36,15 +36,8 @@ import {COMMIT_MOVE_SHORTCUT, Mover} from './actions/mover';
 import {DuplicateAction} from './actions/duplicate';
 import {StackNavigationAction} from './actions/stack_navigation';
 
-import './screenreader/aria_monkey_patcher';
-import {FunctionStubber} from './screenreader/function_stubber_registry';
-
 const KeyCodes = BlocklyUtils.KeyCodes;
 
-// Note that prototype stubs must happen early in the page lifecycle in order to
-// take effect before Blockly loading.
-FunctionStubber.getInstance().stubPrototypes();
-
 /**
  * Class for registering shortcuts for keyboard navigation.
  */