[BUG] Get task can't work for some batch job

[ylwu-amzn]

Hard coded status parsing logic

Get task status for remote job using hard-coded status field https://github.com/opensearch-project/ml-commons/blob/main/plugin/src/main/java/org/opensearch/ml/action/tasks/GetTaskTransportAction.java#L252

                  if ((remoteJob.containsKey("status") && remoteJob.get("status").equals("completed"))
                      || (remoteJob.containsKey("TransformJobStatus") && remoteJob.get("TransformJobStatus").equals("Completed"))) {
                      updatedTask.put(STATE_FIELD, COMPLETED);
                      mlTask.setState(COMPLETED);

                  } else if ((remoteJob.containsKey("status") && remoteJob.get("status").equals("cancelled"))
                      || (remoteJob.containsKey("TransformJobStatus") && remoteJob.get("TransformJobStatus").equals("Stopped"))) {
                      updatedTask.put(STATE_FIELD, CANCELLED);
                      mlTask.setState(CANCELLED);
                  }

Cohere batch embed job will return complete. The current code can't work for this case.

We need to enhance this part. Suggest to remove the hard-coded part by adding settings for status field and status regex.

Bedrock inference job arn can't work

Get Bedrock inference job API needs jobArn, but the jobArn has / which will cause failure "The provided ARN is invalid.", need to escape / to %2F.