Chore: First step towards a github action that regularly notifies about feature toggle cleanup (#79912)

* playing around with csv parsing action

* switch to workflow dispatch

* working script

* add a check to not run on forks

* adding check comment

* no idea who should own, adding myself for now

* adding the cleanup script too

.github/workflows/scripts/feature-toggle-cleanup/feature-toggle-cleanup.js

@@ -0,0 +1,38 @@
+import { parse } from 'csv-parse/sync';
+import fs from 'fs';
+
+/***
+ * Feauture Flag Structure example
+ *  Name: 'disableEnvelopeEncryption',
+    Stage: 'GA',
+    Owner: '@grafana/grafana-as-code',
+    Created: '2022-05-24',
+    requiresDevMode: 'false',
+    RequiresLicense: 'false',
+    RequiresRestart: 'false',
+    FrontendOnly: 'false'
+ * 
+ */
+
+
+export default function cleanupFeatureFlags() {
+	const today = new Date();
+	const sixMonthAgo = today.setMonth(today.getMonth() - 6);
+	const inputFileContents = fs.readFileSync(process.env.FEATURE_TOGGLES_CSV_FILE_PATH);
+	const parsedFeatureFlags = parse(inputFileContents, {
+		columns: true,
+		skip_empty_lines: true,
+		cast: true,
+		cast_date: true,
+	  });
+
+	// Here we can have the custom logic of how to handle what type of feature flag - e.g. GA can be treated differently than experimental and so on.
+	for (const flag of parsedFeatureFlags) {
+		if (flag.Created < sixMonthAgo) {
+			console.log(`The flag ${flag.Name} was created more than 6 months ago. It should be checked.`);
+			console.log(flag);
+		}
+	}
+	
+
+}