Fix invalid index error when eks_audit_logs_pipeline is disabled

[NolanT]

Disables the creation of the aws_s3_bucket_public_access_block and aws_s3_bucket_server_side_encryption_configuration when enable_eks_audit_logs_pipeline is set to false.

This fixes this error

╷
│ Error: Invalid index
│
│   on .rad-security-connect/eks_audit_logs.tf line 40, in resource "aws_s3_bucket_public_access_block" "audit_logs":
│   40:   bucket = aws_s3_bucket.audit_logs[0].id
│     ├────────────────
│     │ aws_s3_bucket.audit_logs is empty tuple
│
│ The given key does not identify an element in this collection value: the
│ collection has no elements.
╵
╷
│ Error: Invalid index
│
│   on .rad-security-connect/eks_audit_logs.tf line 49, in resource "aws_s3_bucket_server_side_encryption_configuration" "audit_logs":
│   49:   bucket = aws_s3_bucket.audit_logs[0].id
│     ├────────────────
│     │ aws_s3_bucket.audit_logs is empty tuple
│
│ The given key does not identify an element in this collection value: the
│ collection has no elements.
╵