Add more validations to linter

- Ensure all variables and outputs are sorted
- Ensure all variables and outputs have a description
- Add data-solutions/data-platform-foundations to linter

Fix all modules to follow these new conventions.

modules/folder/variables.tf

@@ -66,6 +66,12 @@ variable "id" {
   default     = null
 }
 
+variable "logging_exclusions" {
+  description = "Logging exclusions for this folder in the form {NAME -> FILTER}."
+  type        = map(string)
+  default     = {}
+}
+
 variable "logging_sinks" {
   description = "Logging sinks to create for this folder."
   type = map(object({
@@ -80,12 +86,6 @@ variable "logging_sinks" {
   default = {}
 }
 
-variable "logging_exclusions" {
-  description = "Logging exclusions for this folder in the form {NAME -> FILTER}."
-  type        = map(string)
-  default     = {}
-}
-
 variable "name" {
   description = "Folder name."
   type        = string