feat: add rbac.serviceaccounts value

[fllaca]

What issues does your PR fix?

Fixes dags that use the KubernetesPodOperator setting service_account_name argument to a custom service account other than Airflow's:

[2024-07-01, 11:16:27 UTC] {pod.py:1107} INFO - Building pod REDACTED with labels: {'dag_id': '32.02-AgentIngest', 'task_id': 'REDACTED', 'run_id': 'scheduled__2024-07-01T1000000000-03129e074', 'kubernetes_pod_operator': 'True', 'try_number': '2'}
[2024-07-01, 11:16:28 UTC] {base.py:84} INFO - Using connection ID 'kubernetes_default' for task execution.
[2024-07-01, 11:16:28 UTC] {pod_manager.py:334} ERROR - Exception when attempting to create Namespaced Pod: {   "apiVersion": "v1",   "kind": "Pod",   [...REDACTED...]  "serviceAccountName": "mysa",     "tolerations": [],     "volumes": []   } }
Traceback (most recent call last):
  File "/home/airflow/.local/lib/python3.10/site-packages/airflow/providers/cncf/kubernetes/utils/pod_manager.py", line 329, in run_pod_async
    resp = self._client.create_namespaced_pod(
  File "/home/airflow/.local/lib/python3.10/site-packages/kubernetes/client/api/core_v1_api.py", line 7356, in create_namespaced_pod
    return self.create_namespaced_pod_with_http_info(namespace, body, **kwargs)  # noqa: E501
  File "/home/airflow/.local/lib/python3.10/site-packages/kubernetes/client/api/core_v1_api.py", line 7455, in create_namespaced_pod_with_http_info
    return self.api_client.call_api(
  File "/home/airflow/.local/lib/python3.10/site-packages/kubernetes/client/api_client.py", line 348, in call_api
    return self.__call_api(resource_path, method,
  File "/home/airflow/.local/lib/python3.10/site-packages/kubernetes/client/api_client.py", line 180, in __call_api
    response_data = self.request(
  File "/home/airflow/.local/lib/python3.10/site-packages/kubernetes/client/api_client.py", line 391, in request
    return self.rest_client.POST(url,
  File "/home/airflow/.local/lib/python3.10/site-packages/kubernetes/client/rest.py", line 279, in POST
    return self.request("POST", url,
  File "/home/airflow/.local/lib/python3.10/site-packages/kubernetes/client/rest.py", line 238, in request
    raise ApiException(http_resp=r)
kubernetes.client.exceptions.ApiException: (403)
Reason: Forbidden
HTTP response headers: HTTPHeaderDict({'Audit-Id': 'd28ba1ed-88b3-4d23-b564-57833dad63d5', 'Cache-Control': 'no-cache, private', 'Content-Type': 'application/json', 'X-Kubernetes-Pf-Flowschema-Uid': 'd8c1c6ea-5cae-4996-8995-669952a8f74a', 'X-Kubernetes-Pf-Prioritylevel-Uid': '35d5696a-251b-4647-8347-fb0f98fea966', 'Date': 'Mon, 01 Jul 2024 11:16:28 GMT', 'Content-Length': '311'})
HTTP response body: {"kind":"Status","apiVersion":"v1","metadata":{},"status":"Failure","message":"pods \"REDACTED\" is forbidden: error looking up service account dev/mysa: serviceaccount \"mysa\" not found","reason":"Forbidden","details":{"name":"REDACTED","kind":"pods"},"code":403}

NOTE: HTTP response body: {"kind":"Status","apiVersion":"v1","metadata":{},"status":"Failure","message":"pods \"REDACTED\" is forbidden: error looking up service account dev/mysa: serviceaccount \"mysa\" not found","reason":"Forbidden","details":{"name":"REDACTED","kind":"pods"},"code":403}

What does your PR do?

Adds a rbac.serviceaccounts value to allow Airflow's to get/list serviceaccounts

Checklist

For all Pull Requests

• [x] Commits are signed off
• [x] Commits have semantic messages
• [x] Documentation updated
• [x] Passes ct linting

For releasing ONLY

• [ ] Chart.yaml version bumped
• [ ] CHANGELOG.md updated