Revert "Add a ReadOnlyExtraAccess policy (#415)" (#424)

This reverts commit 12b4eba.

Author: jameslinnell

infrastructure/policies.tf

@@ -17,26 +17,3 @@ resource "aws_iam_policy" "ssm_access_policy" {
     ]
   })
 }
-
-resource "aws_iam_policy" "read_only_role_extra_permissions" {
-  name = "ReadOnlyExtraAccess"
-  policy = jsonencode({
-    Version = "2012-10-17",
-    Statement = [
-      {
-        Effect = "Allow",
-        Action = [
-          "kms:Decrypt",
-        ],
-        Resource = [
-          "arn:aws:lambda:eu-west-2:${data.aws_caller_identity.current.account_id}:function:*",
-        ]
-      }
-    ]
-  })
-  tags = {
-    Name      = "ReadOnlyExtraAccess"
-    Workspace = "core"
-  }
-}
-