test(popover): skip flaky screenshot test (#27115)

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## What is the current behavior?
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Popover test is still flaky:
https://github.com/ionic-team/ionic-framework/actions/runs/4611219177/jobs/8150680142

## What is the new behavior?
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this PR. -->

- Re-open tech debt ticket and skip test

## Does this introduce a breaking change?

- [ ] Yes
- [x] No

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core/src/components/popover/test/size/popover.e2e.ts

@@ -9,7 +9,8 @@ test.describe('popover: size', async () => {
    * and massively cut down on screenshots taken. The content has its own
    * backdrop so you can still see the popovers.
    */
-  test('should calculate popover width based on sizing method', async ({ page }) => {
+  // TODO FW-3598
+  test.skip('should calculate popover width based on sizing method', async ({ page }) => {
     await page.goto('/src/components/popover/test/size');
     await page.setViewportSize(Viewports.tablet.portrait); // avoid popovers overlapping