Can we make the ALB Subnet Type agnostic?

[ChrisJBurns]

Is your request related to a problem? Please describe.

We currently deploy our ALB in private subnets within AWS. But the var that is used in the alb module makes reference to local.public_subnet_ids.

For now, we have passed in our private subnet id under the var.public_subnet_ids with a big comment detailing why - but as you can imagine, it's not ideal.

Describe the solution you'd like.

I'd like the subnet variable names to be agnostic as it makes assumptions on the type of subnets people use for their ALB's, as many deploy ALB's into private subnets, it's not just public ones.

[bryantbiggs]

resolved in #366

[github-actions]

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