Fix: inconsistent plan on the first apply when trying to create ssh_keys

[TomerHeber]

Issue & Steps to Reproduce / Feature Request

fixes #772

Solution

Added computed to both fields to avoid race condition.

[TomerHeber]

Adding computed fixes a plan issue.

With computed:

      + path                  = "misc/null-resource"
      + repository            = "https://github.com/tomer-landesman/templates"
      + ssh_keys              = [
          + (known after apply),
        ]
      + terraform_version     = "0.15.1"
      + type                  = "terraform"
    }

Without computed it's missing the id in the first apply

   + repository            = "https://github.com/tomer-landesman/templates"
      + ssh_keys              = [
          + {
              + "name" = "sshkey"
            },
        ]
      + terraform_version     = "0.15.1"

[TomerHeber]

For context data is something like this (with name):

data "env0_ssh_key" "data_ssh_key" {
  count = 1
  name  = "sshkey"

  depends_on = [env0_ssh_key.ssh_key]
}