#10098 moving disabled tab click handlers onto role=tabpanel elements fo...

...r better Voiceover announcement

Not sure if this is the best way to fix. Potentially this event binding is instead moved inside of `_processTabs` as it has to happen on the elem with `role="tablist"` to fix the bug
This will bind to nested tabs as well. You can move this below the call to `_processTabs()` and then use `this.tablist`.