IRSA module refactor (No Breaking changes)

[vara-bonthu]

What does this PR do?

This PR is raised to simplify the IRSA module variables. No breaking changes are introduced by this PR to EKS blueprints.
However, users who are calling IRSA module directly needs a simple change to your code. Check the AFTER code snippet. FAQ.md also provides these details

Before

This is the current usage of consuming IRSA module directly.

module "irsa" {
  source = "github.com/aws-ia/terraform-aws-eks-blueprints//modules/irsa"
  kubernetes_namespace       = "dev"
  kubernetes_service_account = "spark"
  irsa_iam_policies          = [aws_iam_policy.spark.arn]
  addon_context = {
    eks_cluster_id                = var.eks_cluster_id
    eks_oidc_provider_arn         = "arn:${data.aws_partition.current.partition}:iam::${data.aws_caller_identity.current.account_id}:oidc-provider/${local.eks_oidc_issuer_url}"
    eks_oidc_issuer_url           = local.eks_oidc_issuer_url
    irsa_iam_role_path            = "/"
    irsa_iam_permissions_boundary = ""
    aws_caller_identity_account_id = ""
    aws_caller_identity_arn = ""
    aws_eks_cluster_endpoint = ""
    aws_partition_id = ""
    aws_region_name = ""
    tags = {}
  }
}

After

module "irsa" {
  source = "github.com/aws-ia/terraform-aws-eks-blueprints//modules/irsa"
  kubernetes_namespace       = "dev"
  kubernetes_service_account = "spark"
  irsa_iam_policies          = [aws_iam_policy.spark.arn]
  eks_cluster_id             = module.eks_blueprints.eks_cluster_id
  eks_oidc_provider_arn      = module.eks_blueprints.eks_oidc_provider_arn
}

Related Issues
closes #697
closes #814

Motivation

• To simplify user experience to consume IRSA module directly.
• There are number of instances where users want to create IRSA for specific service account

More

• Yes, I have tested the PR using my local account setup (Provide any test evidence report under Additional Notes)
• Yes, I have added a new example under examples to support my PR
• Yes, I have created another PR for add-ons under add-ons repo (if applicable)
• Yes, I have updated the docs for this feature
• Yes, I ran pre-commit run -a with this PR

Note: Not all the PRs required examples and docs except a new pattern or add-on added.

For Moderators

• E2E Test successfully complete before merge?

Additional Notes

[bryantbiggs]

Looks great!

[bryantbiggs]

plan-examples / Plan examples (examples/external-secrets-kubernetes-addon) (pull_request_target) Failing after 8s — Plan examples (examples/external-secrets-kubernetes-addon) will fail due to name change, ok to ignore

[Zvikan]

@vara-bonthu should this have :sub ?

[srhoton]

This is breaking things, I believe. Look at #837