Revert "Fix fetch_access_token_for_cluster in EKS hook" (apache#45526)

* Revert "Fix the way to get STS endpoint in EKS hook (apache#45520)"

This reverts commit 103df61.

* Revert "Fix `fetch_access_token_for_cluster` in EKS hook (apache#45469)"

This reverts commit dc3111a.

providers/src/airflow/providers/amazon/aws/hooks/eks.py

@@ -32,7 +32,6 @@
 from botocore.signers import RequestSigner
 
 from airflow.providers.amazon.aws.hooks.base_aws import AwsBaseHook
-from airflow.providers.amazon.aws.hooks.sts import StsHook
 from airflow.utils import yaml
 from airflow.utils.json import AirflowJsonEncoder
 
@@ -613,7 +612,9 @@ def generate_config_file(
     def fetch_access_token_for_cluster(self, eks_cluster_name: str) -> str:
         session = self.get_session()
         service_id = self.conn.meta.service_model.service_id
-        sts_url = f"{StsHook().conn_client_meta.endpoint_url}/?Action=GetCallerIdentity&Version=2011-06-15"
+        sts_url = (
+            f"https://sts.{session.region_name}.amazonaws.com/?Action=GetCallerIdentity&Version=2011-06-15"
+        )
 
         signer = RequestSigner(
             service_id=service_id,

providers/tests/amazon/aws/hooks/test_eks.py

@@ -1283,13 +1283,11 @@ def test_generate_config_file(self, mock_conn, aws_conn_id, region_name, expecte
             }
 
     @mock.patch("airflow.providers.amazon.aws.hooks.eks.RequestSigner")
-    @mock.patch("airflow.providers.amazon.aws.hooks.eks.StsHook")
     @mock.patch("airflow.providers.amazon.aws.hooks.base_aws.AwsBaseHook.conn")
     @mock.patch("airflow.providers.amazon.aws.hooks.base_aws.AwsBaseHook.get_session")
-    def test_fetch_access_token_for_cluster(self, mock_get_session, mock_conn, mock_sts_hook, mock_signer):
+    def test_fetch_access_token_for_cluster(self, mock_get_session, mock_conn, mock_signer):
         mock_signer.return_value.generate_presigned_url.return_value = "http://example.com"
         mock_get_session.return_value.region_name = "us-east-1"
-        mock_sts_hook.return_value.conn_client_meta.endpoint_url = "https://sts.us-east-1.amazonaws.com"
         hook = EksHook()
         token = hook.fetch_access_token_for_cluster(eks_cluster_name="test-cluster")
         mock_signer.assert_called_once_with(