remove condition from variable (#38)

on tofu 1.9, it fails with this message:

```
│ Error: Invalid function argument
│
│   on .terraform/modules/plt_self_hosted.self_hosted_infra.spacelift_services/variables.tf line 351, in variable "vcs_gateway_domain":
│  351:     condition     = var.vcs_gateway_domain == null || (!startswith(var.vcs_gateway_domain, "http://") && !startswith(var.vcs_gateway_domain, "https://"))
│     ├────────────────
│     │ while calling startswith(str, prefix)
│     │ var.vcs_gateway_domain is null
│
│ Invalid value for "str" parameter: argument must not be null.
```

Author: bodepd

modules/ecs/variables.tf

@@ -62,10 +62,6 @@ variable "drain_desired_count" {
 variable "vcs_gateway_domain" {
   type        = string
   description = "The domain of the VCS Gateway service. This should be the domain name without the protocol, for example vcs-gateway.example.com, not https://vcs-gateway.example.com."
-  validation {
-    condition     = var.vcs_gateway_domain == null || (!startswith(var.vcs_gateway_domain, "http://") && !startswith(var.vcs_gateway_domain, "https://"))
-    error_message = "vcs_gateway_domain should not include a protocol ('http://' or 'https://')"
-  }
 }
 
 variable "vcs_gateway_security_group_id" {

variables.tf

@@ -347,10 +347,6 @@ variable "vcs_gateway_domain" {
   type        = string
   description = "The domain of the VCS Gateway service. This should be the domain name without the protocol, for example vcs-gateway.example.com, not https://vcs-gateway.example.com."
   default     = null
-  validation {
-    condition     = var.vcs_gateway_domain == null || (!startswith(var.vcs_gateway_domain, "http://") && !startswith(var.vcs_gateway_domain, "https://"))
-    error_message = "vcs_gateway_domain should not include a protocol ('http://' or 'https://')"
-  }
 }
 
 variable "vcs_gateway_log_configuration" {