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/remove_response_label.js

@@ -0,0 +1,19 @@
+module.exports = async ({ github, context }) => {
+  const commenter = context.actor;
+  const issue = await github.rest.issues.get({
+    owner: context.repo.owner,
+    repo: context.repo.repo,
+    issue_number: context.issue.number,
+  });
+  const author = issue.data.user.login;
+  const labels = issue.data.labels.map((e) => e.name);
+
+  if (author === commenter && labels.includes("needs:response")) {
+    github.rest.issues.removeLabel({
+      owner: context.repo.owner,
+      repo: context.repo.repo,
+      issue_number: context.issue.number,
+      name: "needs:response",
+    });
+  }
+};