[minor] Add Public ELB Fetching and AWS Secret Creation to gitops-mas-initiator

[Drashti-Malviya]

Related Issues
https://jsw.ibm.com/browse/MASCORE-12900

Description
This PR adds functionality to fetch the public Network Load Balancer (NLB) DNS from AWS and store it in AWS Secrets Manager.

[whitfiea]

Normally we get the vpc id like this

cli/tekton/src/tasks/gitops/gitops-kafka.yml.j2

Lines 74 to 79 in 3aad4a3

	vpc_name=$(aws ec2 describe-vpcs --output yaml | grep $CLUSTER_NAME- | yq '.[].Value // ""' | xargs)
	if [ -z "$vpc_name" ]; then
	# Needed if there is only one cluster in account
	vpc_name=$(aws ec2 describe-vpcs --output yaml | grep $CLUSTER_NAME- | yq '.Value // ""' | xargs)
	fi
	export VPC_ID=$(aws ec2 describe-vpcs --filters '[{"Name": "tag:Name", "Values": ["'$vpc_name'"]}]' --output yaml | yq '.Vpcs[].VpcId' )

as there are issues with similiar named vpcs. We should use CLUSTER_NAME rather than hard code it as it would fail if fvtsaas doesn't exist and we are deployinh to a different cluster

[Drashti-Malviya]

okay used the same approach to get vpc id and remove hardcode value,please check

[whitfiea]

@Drashti-Malviya can you fix the build issue. Plus this needs to be test in an actual fvtsaas execution

[Drashti-Malviya]

okay