fix: Update CreateEdgePackagingJob resourceKey with type string (#3967)

resource key is of type string as per:
https://boto3.amazonaws.com/v1/documentation/api/latest/reference/services/sagemaker/client/create_edge_packaging_job.html

docs mention it is of type string but it is being converted to tuple
causing a ParamValidationError when calling
session.package_model_for_edge

Updating to use string, modified Unit test to cover the use case

Co-authored-by: Ashwin Krishna <ashwikri@amazon.com>

Author: akrishna1995

src/sagemaker/session.py

@@ -2543,7 +2543,7 @@ def package_model_for_edge(
         if tags is not None:
             edge_packaging_job_request["Tags"] = tags
         if resource_key is not None:
-            edge_packaging_job_request["ResourceKey"] = (resource_key,)
+            edge_packaging_job_request["ResourceKey"] = resource_key
 
         LOGGER.info("Creating edge-packaging-job with name: %s", job_name)
         self.sagemaker_client.create_edge_packaging_job(**edge_packaging_job_request)

tests/unit/test_session.py

@@ -2851,9 +2851,9 @@ def test_create_edge_packaging_with_sagemaker_config_injection(sagemaker_session
         "OutputConfig"
     ]["KmsKeyId"]
     expected_tags = SAGEMAKER_CONFIG_EDGE_PACKAGING_JOB["SageMaker"]["EdgePackagingJob"]["Tags"]
-    expected_resource_key = (
-        SAGEMAKER_CONFIG_EDGE_PACKAGING_JOB["SageMaker"]["EdgePackagingJob"]["ResourceKey"],
-    )
+    expected_resource_key = SAGEMAKER_CONFIG_EDGE_PACKAGING_JOB["SageMaker"]["EdgePackagingJob"][
+        "ResourceKey"
+    ]
     sagemaker_session.sagemaker_client.create_edge_packaging_job.assert_called_with(
         RoleArn=expected_role_arn,  # provided from config
         OutputConfig={