ci: replace stale bot with custom implementation

The stale action has a bug where it won't close an issue/PR if it has
comments after the stale label.

.github/scripts/close_unresponsive.js

@@ -0,0 +1,50 @@
+function labeledEvent(data) {
+  return data.event === "labeled" && data.label.name === "needs:response";
+}
+
+const numberOfDaysLimit = 30;
+const close_message = `This has been closed since a request for information has \
+not been answered for ${numberOfDaysLimit} days. It can be reopened when the \
+requested information is provided.`;
+
+module.exports = async ({ github, context }) => {
+  const owner = context.repo.owner;
+  const repo = context.repo.repo;
+
+  const issues = await github.rest.issues.listForRepo({
+    owner: owner,
+    repo: repo,
+    labels: "needs:response",
+  });
+  const numbers = issues.data.map((e) => e.number);
+
+  for (const number of numbers) {
+    const timeline = await github.rest.issues.listEventsForTimeline({
+      owner: owner,
+      repo: repo,
+      issue_number: number,
+    });
+    const data = timeline.data.filter(labeledEvent);
+    const latest_response_label = data[data.length - 1];
+    const created_at = new Date(latest_response_label.created_at);
+    const now = new Date();
+    const diff = now - created_at;
+    const diffDays = diff / (1000 * 60 * 60 * 24);
+
+    if (diffDays > numberOfDaysLimit) {
+      github.rest.issues.update({
+        owner: owner,
+        repo: repo,
+        issue_number: number,
+        state: "closed",
+      });
+
+      github.rest.issues.createComment({
+        owner: owner,
+        repo: repo,
+        issue_number: number,
+        body: close_message,
+      });
+    }
+  }
+};