Fix userdata variables for aws-asg

[GMartinez-Sisti]

Summary

Fix userdata variables for aws-asg

Description

• Adds example for non-ha deploy
• Fixes error when replicas are 1:

╷
│ Error: Invalid index
│
│   on ../../main.tf line 298, in resource "aws_launch_template" "launch_template":
│  298:       redis_primary_endpoint_address    = aws_elasticache_replication_group.redis[0].primary_endpoint_address,
│     ├────────────────
│     │ aws_elasticache_replication_group.redis is empty tuple
│
│ The given key does not identify an element in this collection value: the collection has no elements.
╵
╷
│ Error: Invalid index
│
│   on ../../main.tf line 299, in resource "aws_launch_template" "launch_template":
│  299:       redis_port                        = aws_elasticache_replication_group.redis[0].port,
│     ├────────────────
│     │ aws_elasticache_replication_group.redis is empty tuple
│
│ The given key does not identify an element in this collection value: the collection has no elements.
╵

Type of change

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

Theses changes have been tested in:

• Local environment