Improve return type getProtectedNodeByMachineName() [#3588922]

Currently the return type of NodeKeepTokenService::getProtectedNodeByMachineName() is \Drupal\Core\Entity\EntityInterface|mixed, this can/should be changed to \Drupal\node\NodeInterface|null.

Issue fork node_keep-3588922

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3588922-improve-return-type changes, plain diff MR !20
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