fix(material/list): add command+A for MacOs "select all" functionality.

Fixes a bug in Angular Material `list` when using MacOs `command`+`a` does not work for 'select all functionality'.

Fixes #24781

Author: volvachev

src/material/list/selection-list.ts

@@ -573,7 +573,7 @@ export class MatSelectionList
         if (
           keyCode === A &&
           this.multiple &&
-          hasModifierKey(event, 'ctrlKey') &&
+          hasModifierKey(event, 'ctrlKey', 'metaKey') &&
           !manager.isTyping()
         ) {
           const shouldSelect = this.options.some(option => !option.disabled && !option.selected);