Remove unused npm dependencies

It looks like these dependencies aren't actually used anywhere, so stop depending on them.

The motivation for this change is that the dependency on `resolve` causes errors to be logged in logs during plugin discovery, because the package includes tests that have malformed `package.json` files. If we don't actually need the dependency it'd be nice to remove it so those errors are no longer logged (so users don't ask us about them).

Also remove `read-package-tree` since it is deprecated.

Also remove `builtin-modules`, since it doesn't appear to be used either.

provider/cmd/pulumi-resource-gitlab/schema.json

@@ -32,11 +32,6 @@
         "nodejs": {
             "packageDescription": "A Pulumi package for creating and managing GitLab resources.",
             "readme": "\u003e This provider is a derived work of the [Terraform Provider](https://github.com/gitlabhq/terraform-provider-gitlab)\n\u003e distributed under [MPL 2.0](https://www.mozilla.org/en-US/MPL/2.0/). If you encounter a bug or missing feature,\n\u003e first check the [`pulumi-gitlab` repo](https://github.com/pulumi/pulumi-gitlab/issues); however, if that doesn't turn up anything,\n\u003e please consult the source [`terraform-provider-gitlab` repo](https://github.com/gitlabhq/terraform-provider-gitlab/issues).",
-            "dependencies": {
-                "builtin-modules": "3.0.0",
-                "read-package-tree": "^5.2.1",
-                "resolve": "^1.7.1"
-            },
             "devDependencies": {
                 "@types/node": "^10.0.0"
             },

provider/resources.go

@@ -92,11 +92,6 @@ func Provider() tfbridge.ProviderInfo {
 			"gitlab_user_gpgkey": {Tok: gitLabResource("UserGpgKey")},
 		},
 		JavaScript: &tfbridge.JavaScriptInfo{
-			Dependencies: map[string]string{
-				"builtin-modules":   "3.0.0",
-				"read-package-tree": "^5.2.1",
-				"resolve":           "^1.7.1",
-			},
 			DevDependencies: map[string]string{
 				"@types/node": "^10.0.0", // so we can access strongly typed node definitions.
 			},