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/cloudsql-instance/README.md

@@ -106,7 +106,7 @@ module "db" {
 | *availability_type* | Availability type for the primary replica. Either `ZONAL` or `REGIONAL` | <code title="">string</code> |  | <code title="">ZONAL</code> |
 | *backup_configuration* | Backup settings for primary instance. Will be automatically enabled if using MySQL with one or more replicas | <code title="object&#40;&#123;&#10;enabled            &#61; bool&#10;binary_log_enabled &#61; bool&#10;&#125;&#41;">object({...})</code> |  | <code title="&#123;&#10;enabled            &#61; false&#10;binary_log_enabled &#61; false&#10;&#125;">...</code> |
 | *databases* | Databases to create once the primary instance is created. | <code title="list&#40;string&#41;">list(string)</code> |  | <code title="">null</code> |
-| *deletion_protection* | None | <code title="">bool</code> |  | <code title="">false</code> |
+| *deletion_protection* | Allow terraform to delete instances. | <code title="">bool</code> |  | <code title="">false</code> |
 | *disk_size* | Disk size in GB. Set to null to enable autoresize. | <code title="">number</code> |  | <code title="">null</code> |
 | *disk_type* | The type of data disk: `PD_SSD` or `PD_HDD`. | <code title="">string</code> |  | <code title="">PD_SSD</code> |
 | *flags* | Map FLAG_NAME=>VALUE for database-specific tuning. | <code title="map&#40;string&#41;">map(string)</code> |  | <code title="">null</code> |

modules/cloudsql-instance/variables.tf

@@ -50,8 +50,9 @@ variable "databases" {
 }
 
 variable "deletion_protection" {
-  type    = bool
-  default = false
+  description = "Allow terraform to delete instances."
+  type        = bool
+  default     = false
 }
 
 variable "disk_size" {
@@ -110,13 +111,13 @@ variable "replicas" {
   default     = null
 }
 
+variable "tier" {
+  description = "The machine type to use for the instances."
+  type        = string
+}
+
 variable "users" {
   description = "Map of users to create in the primary instance (and replicated to other replicas) in the format USER=>PASSWORD. For MySQL, anything afterr the first `@` (if persent) will be used as the user's host. Set PASSWORD to null if you want to get an autogenerated password"
   type        = map(string)
   default     = null
 }
-
-variable "tier" {
-  description = "The machine type to use for the instances."
-  type        = string
-}