chore: updating backstage plugin config (#9)

### Description

This PR updates the plugin configuration required in the latest version
of Backstage.

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package.json

@@ -10,7 +10,9 @@
     "types": "dist/index.d.ts"
   },
   "backstage": {
-    "role": "backend-plugin-module"
+    "role": "backend-plugin-module",
+    "pluginId": "catalog",
+    "pluginPackage": "pagerduty-entity-processor"
   },
   "homepage": "https://pagerduty.github.io/backstage-plugin-docs/index.html",
   "repository": {