Fix import order and update tests for AwsCloudWatchEmfExporter

- Fix isort import order in base_emf_exporter.py
- Update test_create_emf_exporter_lambda_with_valid_headers to expect is_lambda=True
- Update test_create_emf_exporter_non_lambda_with_valid_headers to expect is_lambda=False

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: syed-ahsan-ishtiaque

aws-opentelemetry-distro/src/amazon/opentelemetry/distro/exporter/aws/metrics/base_emf_exporter.py

@@ -11,6 +11,7 @@
 from collections import defaultdict
 from typing import Any, Dict, List, Optional, Tuple
 
+from amazon.opentelemetry.distro._aws_resource_attribute_configurator import get_service_attribute
 from opentelemetry.sdk.metrics import Counter
 from opentelemetry.sdk.metrics import Histogram as HistogramInstr
 from opentelemetry.sdk.metrics import ObservableCounter, ObservableGauge, ObservableUpDownCounter, UpDownCounter
@@ -30,8 +31,6 @@
 from opentelemetry.sdk.resources import Resource
 from opentelemetry.util.types import Attributes
 
-from amazon.opentelemetry.distro._aws_resource_attribute_configurator import get_service_attribute
-
 logger = logging.getLogger(__name__)
 
 # Constants for Lambda EMF dimensions

aws-opentelemetry-distro/tests/amazon/opentelemetry/distro/test_aws_opentelementry_configurator.py

@@ -1360,6 +1360,7 @@ def test_create_emf_exporter_lambda_with_valid_headers(self, mock_get_session, m
                 namespace="test-namespace",
                 log_group_name="test-group",
                 log_stream_name="test-stream",
+                is_lambda=True,
             )
 
     @patch("amazon.opentelemetry.distro.aws_opentelemetry_configurator._fetch_logs_header")
@@ -1395,6 +1396,7 @@ def test_create_emf_exporter_non_lambda_with_valid_headers(
                 namespace="test-namespace",
                 log_group_name="test-group",
                 log_stream_name="test-stream",
+                is_lambda=False,
             )
 
     @patch("amazon.opentelemetry.distro.aws_opentelemetry_configurator._fetch_logs_header")