Conditionally set TF aws_s3_object SSE and ACLs

[rifelpet]

We used to set SSE to an empty string, now we leave it unset. This should fix this failing job.

�[31m│ �[31mError: expected server_side_encryption to be one of ["AES256" "aws:kms" "aws:kms:dsse"], got 
�[31m│ 
�[31m│   with aws_s3_object.cluster-completed-spec,
�[31m│   on kubernetes.tf line 1104, in resource "aws_s3_object" "cluster-completed-spec":
�[31m│ 1104:   server_side_encryption = ""
�[31m│ 
�[31m╵
�[31m│ �[31mError: expected acl to be one of ["private" "public-read" "public-read-write" "authenticated-read" "aws-exec-read" "bucket-owner-read" "bucket-owner-full-control"], got 
�[31m│ 
�[31m│   with aws_s3_object.e2e-e2e-kops-scenario-ipv6-terraform-test-cncf-aws-k8s-io-addons-bootstrap,
�[31m│   on kubernetes.tf line 1135, in resource "aws_s3_object" "e2e-e2e-kops-scenario-ipv6-terraform-test-cncf-aws-k8s-io-addons-bootstrap":
�[31m│ 1135:   acl                    = ""
�[31m│  

Also attempting to keep the generated terraform files in job artifacts for easier troubleshooting.

[rifelpet]

/test pull-kops-e2e-aws-terraform

[rifelpet]

Confirmed the file is being saved in artifacts and the fields are no longer set to empty strings:

https://storage.googleapis.com/kubernetes-jenkins/pr-logs/pull/kops/16818/pull-kops-e2e-aws-terraform/1832451965536178176/artifacts/terraform/kubernetes.tf

/cc @hakman

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