**Apache Airflow version**: 2.0.1


**Kubernetes version (if you are using kubernetes)** (use `kubectl version`): 1.18

**Environment**: GKE

- **Cloud provider or hardware configuration**: GKE on GCP
- **OS** (e.g. from /etc/os-release): Debian 10
- **Kernel** (e.g. `uname -a`): 5.4.89+

**What happened**:

When executing a KuberentesPodOperator with `is_delete_operator_pod=True`, if the Pod doesn't complete successfully, then a 404 error is raised when attempting to get the final pod status.  This doesn't cause any major operational issues to us as the Task fails anyway, however it does cause confusion for our users when looking at the logs for their failed runs.

```
Traceback (most recent call last):
  File "/usr/local/lib/python3.8/site-packages/airflow/models/taskinstance.py", line 1112, in _run_raw_task
    self._prepare_and_execute_task_with_callbacks(context, task)
  File "/usr/local/lib/python3.8/site-packages/airflow/models/taskinstance.py", line 1285, in _prepare_and_execute_task_with_callbacks
    result = self._execute_task(context, task_copy)
  File "/usr/local/lib/python3.8/site-packages/airflow/models/taskinstance.py", line 1310, in _execute_task
    result = task_copy.execute(context=context)
  File "/usr/local/lib/python3.8/site-packages/airflow/providers/cncf/kubernetes/operators/kubernetes_pod.py", line 341, in execute
    status = self.client.read_namespaced_pod(self.pod.metadata.name, self.namespace)
  File "/usr/local/lib/python3.8/site-packages/kubernetes/client/apis/core_v1_api.py", line 18446, in read_namespaced_pod
    (data) = self.read_namespaced_pod_with_http_info(name, namespace, **kwargs)
  File "/usr/local/lib/python3.8/site-packages/kubernetes/client/apis/core_v1_api.py", line 18524, in read_namespaced_pod_with_http_info
    return self.api_client.call_api('/api/v1/namespaces/{namespace}/pods/{name}', 'GET',
  File "/usr/local/lib/python3.8/site-packages/kubernetes/client/api_client.py", line 330, in call_api
    return self.__call_api(resource_path, method,
  File "/usr/local/lib/python3.8/site-packages/kubernetes/client/api_client.py", line 163, in __call_api
    response_data = self.request(method, url,
  File "/usr/local/lib/python3.8/site-packages/kubernetes/client/api_client.py", line 351, in request
    return self.rest_client.GET(url,
  File "/usr/local/lib/python3.8/site-packages/kubernetes/client/rest.py", line 227, in GET
    return self.request("GET", url,
  File "/usr/local/lib/python3.8/site-packages/kubernetes/client/rest.py", line 222, in request
    raise ApiException(http_resp=r)
kubernetes.client.rest.ApiException: (404)
Reason: Not Found
```

**What you expected to happen**:

A 404 error should not be raised - the pod should either be deleted after the state is retrieved, or the final_state returned from `create_new_pod_for_operator` should be used.

**How to reproduce it**:
Run A KubernetesPodOperator that doesn't result Pod with state SUCCESS with `is_delete_operator_pod=True` 

**Anything else we need to know**:
This appears to have been introduced here: https://github.com/apache/airflow/pull/11369 by adding:
```
status = self.client.read_namespaced_pod(self.pod.metadata.name, self.namespace)
```
if the pod state != SUCCESS

airflow/providers/cncf/kubernetes/utils/pod_launcher.py
"""Status of the PODs"""
    PENDING = 'pending'
    RUNNING = 'running'
    FAILED = 'failed'
    SUCCEEDED = 'succeeded'
class PodLauncher(LoggingMixin):
    """Launches PODS"""
    def __init__(
        self,
        kube_client: client.CoreV1Api = None,
        in_cluster: bool = True,
        cluster_context: Optional[str] = None,
        extract_xcom: bool = False,
    ):
        """
        Creates the launcher.
        :param kube_client: kubernetes client
        :param in_cluster: whether we are in cluster
        :param cluster_context: context of the cluster
        :param extract_xcom: whether we should extract xcom
        """
        super().__init__()
        self._client = kube_client or get_kube_client(in_cluster=in_cluster, cluster_context=cluster_context)
        self._watch = watch.Watch()
        self.extract_xcom = extract_xcom
    def run_pod_async(self, pod: V1Pod, **kwargs):