DT-560 updates k8s and adds vpc cidr input

[christopher-comet]

https://comet-ml.atlassian.net/browse/DT-560

Also added a statebackend.tf file that can be uncommented and filled out if desired.

Tested with both with and without declaring a vpc_cidr in the .tfvars. Smoke-tested Comet in one of the deploys as well.

Should be good to merge.

[Copilot]

Pull Request Overview

This PR updates the Kubernetes (EKS) default version and adds a new VPC CIDR variable to better configure the VPC resources. It also introduces a commented-out state backend configuration file for Terraform state management.

• Introduces a new variable "vpc_cidr" in several modules for consistency.
• Updates the default Kubernetes version from 1.27 to 1.32.
• Adds a template "statebackend.tf" file for optional S3 backend configuration.

Reviewed Changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
variables.tf	Added "vpc_cidr" variable and updated EKS version.
terraform.tfvars	Comments out environment_tag and adds VPC CIDR hints.
statebackend.tf	Provides instructions for S3 backend configuration.
modules/comet_vpc/variables.tf	Added "vpc_cidr" variable for the VPC module.
modules/comet_vpc/main.tf	Uses the variable "vpc_cidr" instead of a hard-coded value.
main.tf	Passes "vpc_cidr" into the VPC module.

Comments suppressed due to low confidence (2)

variables.tf:157

• Please update relevant documentation to indicate that the default EKS cluster version has been updated from 1.27 to 1.32 to ensure consistency with supported module versions.

default     = "1.32"

terraform.tfvars:14

• If commenting out the environment_tag is intentional, please update the associated documentation or comments to clarify this configuration choice for future maintainers.

# environment_tag = "deployment-development"