Fixes: #5104
This reverts a code change that was checking initially for the
SecretsProvider of the currentStack being an empty string. When it
was an empty string, we were checking the backend type and we were
setting a serviceSecretsManager. This wasn't correct, the logic
needed to check for an empty SecretsProvider AND an empty EncryptionSalt
The important part is that it needed to check for the EncryptionSalt
to make sure it wasn't a passphrase secrets manger
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