Add button to select all text in a preformatted block

[JammyDodger]

Esto ahora no solo está disponible en el núcleo, sino que también está habilitado por defecto.

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Just a little extra announcement to append to this… The setting has proved to be so useful and universally lauded that it is now not only default on but also tucked away as a hidden site setting: https://github.com/discourse/discourse/commit/81f3f56deb9d9f363e8b3bdcf81306fc34751d7d