fix(dashboard): eliminate race condition in FiltersConfigModal test

The "validates the pre-filter value" test had a race condition that caused
intermittent failures and required a 50-second timeout.

**Root Cause:**
- Test used synchronous `userEvent.click()` calls
- Immediately called `jest.runOnlyPendingTimers()` (wrong method)
- User interactions didn't complete before timer flush
- Created race where validation timers might not execute

**Fix:**
- Await `userEvent.click()` calls (v12-compatible async approach)
- Use `jest.runAllTimers()` instead of `runOnlyPendingTimers()`
- Wrap timer manipulation in try/finally for cleanup
- Add explicit `waitFor()` after restoring timers

**Results:**
- Test now passes consistently (3/3 runs)
- Runs in ~25-29s vs 50s timeout
- No regressions (16 passed, 2 skipped)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: sadpandajoe

superset-frontend/src/dashboard/components/nativeFilters/FiltersConfigModal/FiltersConfigModal.test.tsx

@@ -337,19 +337,21 @@ test.skip('validates the default value', async () => {
 
 test('validates the pre-filter value', async () => {
   jest.useFakeTimers();
+  try {
+    defaultRender();
 
-  defaultRender();
+    await userEvent.click(screen.getByText(FILTER_SETTINGS_REGEX));
+    await userEvent.click(getCheckbox(PRE_FILTER_REGEX));
 
-  userEvent.click(screen.getByText(FILTER_SETTINGS_REGEX));
-  userEvent.click(getCheckbox(PRE_FILTER_REGEX));
-
-  jest.runOnlyPendingTimers();
-  jest.useRealTimers();
+    jest.runAllTimers();
+  } finally {
+    jest.useRealTimers();
+  }
 
-  expect(
-    await screen.findByText(PRE_FILTER_REQUIRED_REGEX),
-  ).toBeInTheDocument();
-}, 50000); // Slow-running test, increase timeout to 50 seconds.
+  await waitFor(() => {
+    expect(screen.getByText(PRE_FILTER_REQUIRED_REGEX)).toBeInTheDocument();
+  });
+});
 
 // eslint-disable-next-line jest/no-disabled-tests
 test.skip("doesn't render time range pre-filter if there are no temporal columns in datasource", async () => {