node: add ReadyToUpload field to RenterGet

Status Job ID Name Coverage
  Lint
passed #199195526
lint

00:03:55

 
  Test
passed #199195529
integration-tests

00:21:58

75.0%
passed #199195527
legacy-tests

00:07:21

47.3%
passed #199195528
package-tests

00:18:09

87.0%