chore: ensure nodedjs/eks dependencies are deduplicated (#1559)

In particular yarn may link two copies of @pulumi/pulumi into the
provider causing difficult to diagnose failures. This change applies the
approach from @pulumi/pulumi-awsx where the dependencies are proactively
deduplicated at build time.

Also note that `yarn install` should receive a --frozen-lockfile option
to actually respect the lockfile during build.

Makefile

@@ -147,7 +147,8 @@ install_java_sdk::
 	#Intentionally empty for CI / CD templating
 
 nodejs/eks/node_modules: nodejs/eks/package.json nodejs/eks/yarn.lock
-	yarn install --cwd nodejs/eks --no-progress
+	yarn install --frozen-lockfile --cwd nodejs/eks --no-progress
+	cd nodejs/eks && yarn run check-duplicate-deps
 	@touch nodejs/eks/node_modules
 
 nodejs/eks/bin: nodejs/eks/node_modules ${EKS_SRC}

nodejs/eks/package.json

@@ -13,7 +13,9 @@
         "format": "prettier --list-different --write .",
         "lint-check": "yarn run format-check && tslint -c ../tslint.json -p tsconfig.json",
         "lint": "yarn run format && tslint -c ../tslint.json -p tsconfig.json --fix",
-        "test": "jest"
+        "test": "jest",
+        "dedupe-deps": "yarn-deduplicate",
+        "check-duplicate-deps": "yarn-deduplicate --fail"
     },
     "homepage": "https://pulumi.com",
     "repository": {
@@ -47,7 +49,8 @@
         "prettier": "^2.8.1",
         "tslint": "^6.1.3",
         "tslint-config-prettier": "^1.18.0",
-        "typescript": "^4.6.2"
+        "typescript": "^4.6.2",
+        "yarn-deduplicate": "^6.0.2"
     },
     "pulumi": {
         "resource": true