Convert frontend code to typescript (#31559)

None of the frontend js/ts files was touched besides these two commands
(edit: no longer true, I touched one file in
61105d0618
because of a deprecation that was not showing before the rename).

`tsc` currently reports 778 errors, so I have disabled it in CI as
planned.

Everything appears to work fine.

web_src/js/features/admin/users.ts

@@ -0,0 +1,39 @@
+export function initAdminUserListSearchForm() {
+  const searchForm = window.config.pageData.adminUserListSearchForm;
+  if (!searchForm) return;
+
+  const form = document.querySelector('#user-list-search-form');
+  if (!form) return;
+
+  for (const button of form.querySelectorAll(`button[name=sort][value="${searchForm.SortType}"]`)) {
+    button.classList.add('active');
+  }
+
+  if (searchForm.StatusFilterMap) {
+    for (const [k, v] of Object.entries(searchForm.StatusFilterMap)) {
+      if (!v) continue;
+      for (const input of form.querySelectorAll(`input[name="status_filter[${k}]"][value="${v}"]`)) {
+        input.checked = true;
+      }
+    }
+  }
+
+  for (const radio of form.querySelectorAll('input[type=radio]')) {
+    radio.addEventListener('click', () => {
+      form.submit();
+    });
+  }
+
+  const resetButtons = form.querySelectorAll('.j-reset-status-filter');
+  for (const button of resetButtons) {
+    button.addEventListener('click', (e) => {
+      e.preventDefault();
+      for (const input of form.querySelectorAll('input[type=radio]')) {
+        if (input.name.startsWith('status_filter[')) {
+          input.checked = false;
+        }
+      }
+      form.submit();
+    });
+  }
+}