Update auto integ test app for new propagator pkg (#40)

Author: NathanielRN

integration-test-apps/auto-instrumentation/flask/create_flask_app.py

@@ -10,7 +10,7 @@
 from flask import Flask, session
 import logging
 from opentelemetry import trace
-from opentelemetry.sdk.extension.aws.trace.propagation.aws_xray_format import (
+from opentelemetry.propagators.aws.aws_xray_propagator import (
     TRACE_ID_DELIMITER,
     TRACE_ID_FIRST_PART_LENGTH,
     TRACE_ID_VERSION,

integration-test-apps/auto-instrumentation/flask/requirements.txt

@@ -3,4 +3,5 @@ requests
 flask
 
 opentelemetry-distro[otlp] # also installs opentelemetry-exporter-otlp
+opentelemetry-propagator-aws-xray
 opentelemetry-sdk-extension-aws