PDI-12215

Allow environment variables with encrypted passwords for AWS credentials

The [s3csvinput.jar](https://github.com/pentaho/pentaho-kettle/blob/master/assembly/package-res/plugins/steps/S3CsvInput/s3csvinput.jar) stored in Pentaho Kettle also needs to be updated to allow for Encr.decryptPasswordOptionallyDecrypted() in `org.pentaho.di.trans.steps.s3csvinput.S3CsvInputMeta.getS3Service()`.  The jar's source is not checked into the Pentaho GitHub account.