update equinox terraform code to fix kubespray CI (#9702)

* add terraform lock files to ignore list

* move contrib/terraform/metal to contrib/terraform/equinix to reflect upstream change

contrib/terraform/equinix/provider.tf

@@ -0,0 +1,13 @@
+terraform {
+  required_version = ">= 1.0.0"
+  required_providers {
+    equinix = {
+      source  = "equinix/equinix"
+      version = ">=1.11.0"
+    }
+  }
+}
+
+# Configure the Equinix Metal Provider
+provider "equinix" {
+}