Bump yarn JS package manager 1.22.22 to 4.9.4

This removes sha1 hashes from yarn.lock. Compliant with microsoft hashing.

This adds the yarn berry config / package files: .yarn/ project-local workspace and .yarnrc.yml berry config

Here we bootstrap yarnin devcontainer postCreate

.devcontainer/devcontainer.json

@@ -4,7 +4,7 @@
         "ghcr.io/devcontainers/features/docker-in-docker:2": {},
         "ghcr.io/devcontainers/features/azure-cli:1": {}
     },
-    "postCreateCommand": "npm install -g @devcontainers/cli",
+    "postCreateCommand": "corepack enable && corepack prepare yarn@4.9.4 --activate && npm install -g @devcontainers/cli",
     "customizations": {
         "vscode": {
             "extensions": [

.yarnrc.yml

@@ -0,0 +1 @@
+nodeLinker: node-modules

package.json

@@ -1,12 +1,12 @@
 {
   "files": [
-		"src"
-	],
-	"devDependencies": {
-		"mkdirp": "0.5.5",
-		"copyfiles": "^2.4.1",
-		"handlebars": "^4.7.7",
-		"jsonc": "^2.0.0",
-		"rimraf": "^3.0.2"
-	}
-}
+    "src"
+  ],
+  "devDependencies": {
+    "copyfiles": "^2.4.1",
+    "handlebars": "^4.7.7",
+    "jsonc": "^2.0.0",
+    "mkdirp": "0.5.5",
+    "rimraf": "^3.0.2"
+  }
+}