Fix DemoApps workflows and remove old EKS layers

[diego-ojeda-binbash]

What?

• Fix DemoApps workflows
• Remove old EKS layers

Why?

• DemoApps workflows were broken due to changes in the Ref Arch
• We no longer use or maintain those old EKS layers

References

• Closes https://github.com/binbashar/le-devops-workflows/issues/44

[github-actions[bot]]

Infracost report

💰 Monthly cost will not change

Cost details

``` ────────────────────────────────── Project: binbashar/le-tf-infra-aws/apps-devstg/us-east-1/databases-aurora/rds-export-to-s3 Module path: apps-devstg/us-east-1/databases-aurora/rds-export-to-s3 Errors: Passed var file does not exist: apps-devstg/us-east-1/config/backend.tfvars. Make sure you are passing the var file path relative to the --path flag. Diff baseline error: Passed var file does not exist: apps-devstg/us-east-1/config/backend.tfvars. Make sure you are passing the var file path relative to the --path flag. ────────────────────────────────── Project: binbashar/le-tf-infra-aws/apps-devstg/us-east-1/databases-mysql --/rds-export-to-s3 Module path: apps-devstg/us-east-1/databases-mysql --/rds-export-to-s3 Errors: Passed var file does not exist: apps-devstg/us-east-1/config/backend.tfvars. Make sure you are passing the var file path relative to the --path flag. Diff baseline error: Passed var file does not exist: apps-devstg/us-east-1/config/backend.tfvars. Make sure you are passing the var file path relative to the --path flag. ────────────────────────────────── 2371 cloud resources were detected: ∙ 589 were estimated, 452 of which include usage-based costs, see https://infracost.io/usage-file ∙ 1621 were free, rerun with --show-skipped to see details ∙ 161 are not supported yet, rerun with --show-skipped to see details ```

_{This comment will be updated when code changes.}