[Improve][Config] Support ignore plugin_input/plugin_output of simple job config

[hailin0]

Purpose of this pull request

[Config] Support ignore plugin_input/plugin_output of simple job config

Does this PR introduce any user-facing change?

Remove plugin_input/plugin_output from simple job config(1 source/1 sink)

env {
  parallelism = 1
  job.mode = "BATCH"
}

source {
  FakeSource {
    schema = {
      fields {
        name = "string"
        age = "int"
      }
    }
  }
}

transform {
  Sql {
    query = "select *, 1 as f1 from dual"
  }
  Sql {
    query = "select *, 2 as f2 from dual"
  }
}

sink {
  Console {
  }
}

How was this patch tested?

Check list

• If any new Jar binary package adding in your PR, please add License Notice according
  New License Guide
• If necessary, please update the documentation to describe the new feature. https://github.com/apache/seatunnel/tree/dev/docs
• If you are contributing the connector code, please check that the following files are updated:
  1. Update plugin-mapping.properties and add new connector information in it
  2. Update the pom file of seatunnel-dist
  3. Add ci label in label-scope-conf
  4. Add e2e testcase in seatunnel-e2e
  5. Update connector plugin_config
• Update the release-note.