NPM: Improve package validation (#112426)

* update validation script to run all checks, but fail if any fail

* fix package validation

* reduce comment

packages/grafana-i18n/package.json

@@ -28,6 +28,7 @@
       "require": "./src/internal/index.ts"
     },
     "./eslint-plugin": {
+      "types": "./src/eslint/index.d.ts",
       "import": "./src/eslint/index.cjs",
       "require": "./src/eslint/index.cjs"
     }

packages/grafana-i18n/src/eslint/index.d.ts

@@ -0,0 +1,6 @@
+// Stub type definition for the eslint plugin to pass our package validation.
+// Will revisit this when we fix our package building and packaging process.
+
+// eslint-disable-next-line @typescript-eslint/no-explicit-any
+declare const plugin: any;
+export = plugin;