[pt-br] Add tasks/run-application/scale-stateful-set.md

[paulofponciano]

Esse PR traz a localização da página https://kubernetes.io/docs/tasks/run-application/scale-stateful-set/ para PT-BR.
Adicionado a raiz de /content/pt-br/docs/tasks/run-application o arquivo scale-stateful-set.md, ficando localizado como /content/pt-br/docs/tasks/run-application/scale-stateful-set.md no repositório.

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This PR brings the localization of the page https://kubernetes.io/docs/tasks/run-application/scale-stateful-set/ to PT-BR.
The file scale-stateful-set.md was added to the root of /content/pt-br/docs/tasks/run-application, resulting in the path /content/pt-br/docs/tasks/run-application/scale-stateful-set.md in the repository.

Issue

Closes: #50951

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[paulofponciano]

/cc @stormqueen1990