Updating metadata call to determine AZ

[jaradtke-aws]

Issue #, if available:
The code to determine which Availability Zone (AZ) the node running this pod is in had not worked on a new deployment (Feb 2025). Troubleshooting indicated that the script was unable to determine the AZ. This update provides a method using IMDSv2

https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/configuring-instance-metadata-service.html#instance-metadata-retrieval-examples

Description of changes:

# Am I on ec2 instances?
if [[ ${zone} == "unknown" ]]; then
-  # zone=$(curl -m2 -s http://169.254.169.254/latest/dynamic/instance-identity/document | jq -r '.availabilityZone' | grep -o .$)
+  zone=$(TOKEN=`curl -X PUT "http://169.254.169.254/latest/api/token" -H "X-aws-ec2-metadata-token-ttl-seconds: 21600"` && curl -H "X-aws-ec2-metadata-token: $TOKEN" http://169.254.169.254/latest/dynamic/instance-identity/document | jq -r '.availabilityZone' | grep -o .$)
fi

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