Make the load balancer optional

[bmbferreira]

Is your request related to a new offering from AWS?

No

Is your request related to a problem? Please describe.

Currently we are forcing the usage of a load balancer associated to the ecs service (either external or created within the module). That shouldn't be required since the access could be provided with something like cloudflare tunnels or AWS SSM sessions to make atlantis accessible from private networks without the need of a load balancer.

Describe the solution you'd like.

Make the load balancer optional and allow the service to be created without any load balancer associated with it: #409

Describe alternatives you've considered.

Create a private load balancer but still, I will be paying for it and I don't need it if I want to use cloudflare tunnels.

Additional context

N/A

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