Make namespace in destination as a list of string

[AkakievKD]

Description

Make namespace in destination as a list of string then you won't have to duplicate other fields and there will be less code

Potential Terraform Configuration

    "dev" = {
      source_repos = ["*"]

      destination = [{
        server    = ""
        name      = ""
        namespace = ["dev" , "prod"] list of namespaces
      }]

      cluster_resource_whitelist = [{
        group = "*"
        kind  = "*"
      }]

      role = [
        {
          name     = ""
          policies = [""]
          groups   = [""]
        }
      ]
    },