test(radio): re-enable keyboard navigation (#28747)

Issue number: internal

---------

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## What is the current behavior?
<!-- Please describe the current behavior that you are modifying. -->

The keyboard navigation tests for radio were disable due to flakiness
with Safari when it came to the CI.

## What is the new behavior?
<!-- Please describe the behavior or changes that are being added by
this PR. -->

- Re-enabled the tests.

Debugging was done with a saved artifact.

The artifact didn't provide a clear reason of why it flakes. But it did
seem that the test was tabbing before the Safari page finished loading.
I've added a `waitFor()` to verify that the radios have rendered. This
was done for Safari only to prevent any additional wait time.

## Does this introduce a breaking change?

- [ ] Yes
- [x] No

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## Other information

<!-- Any other information that is important to this PR such as
screenshots of how the component looks before and after the change. -->

There is no great way to test this since it only flakes on GitHub.

core/src/components/radio/test/a11y/radio.e2e.ts

@@ -15,9 +15,8 @@ configs({ modes: ['ios'], directions: ['ltr'] }).forEach(({ title, config }) =>
     });
   });
 
-  // TODO(FW-5715): re-enable test
-  test.skip(title('radio: keyboard navigation'), () => {
-    test.beforeEach(async ({ page }) => {
+  test.describe(title('radio: keyboard navigation'), () => {
+    test.beforeEach(async ({ page, browserName }) => {
       await page.setContent(
         `
       <ion-app>
@@ -59,6 +58,21 @@ configs({ modes: ['ios'], directions: ['ltr'] }).forEach(({ title, config }) =>
     `,
         config
       );
+
+      if (browserName === 'webkit') {
+        const radio = page.locator('#first-group ion-radio').first();
+        /**
+         * Sometimes Safari does not focus the first radio.
+         * This is a workaround to ensure the first radio is focused.
+         *
+         * Wait for the first radio to be rendered before tabbing.
+         * This is necessary because the first radio may not be rendered
+         * when the page first loads.
+         *
+         * This would cause the first radio to be skipped when tabbing.
+         */
+        await radio.waitFor();
+      }
     });
 
     test('tabbing should switch between radio groups', async ({ page, pageUtils }) => {

core/src/components/radio/test/legacy/a11y/radio.e2e.ts

@@ -6,9 +6,23 @@ import { configs, test } from '@utils/test/playwright';
  */
 configs({ modes: ['ios'], directions: ['ltr'] }).forEach(({ title, config }) => {
   test.describe(title('radio: a11y'), () => {
-    test.beforeEach(async ({ page, skip }) => {
-      skip.browser('webkit', 'Tabbing is flaky in Safari');
+    test.beforeEach(async ({ page, browserName }) => {
       await page.goto(`/src/components/radio/test/legacy/a11y`, config);
+
+      if (browserName === 'webkit') {
+        const radio = page.locator('#first-group ion-radio').first();
+        /**
+         * Sometimes Safari does not focus the first radio.
+         * This is a workaround to ensure the first radio is focused.
+         *
+         * Wait for the first radio to be rendered before tabbing.
+         * This is necessary because the first radio may not be rendered
+         * when the page first loads.
+         *
+         * This would cause the first radio to be skipped when tabbing.
+         */
+        await radio.waitFor();
+      }
     });
     test('tabbing should switch between radio groups', async ({ page, pageUtils }) => {
       const firstGroupRadios = page.locator('#first-group ion-radio');