Un-skip E2E test: idletimeout.spec.ts if needed

[jpandersen87]

Fixes #16060

This PR unskips the idletimeout test and adds a new one in order to test time moving forward under/over the timeout. The tests use the page.clock functions in order to artificially move time forward mimicing idle.

[github-actions]

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✅ No vulnerabilities or license issues or OpenSSF Scorecard issues found.

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Branch deployed to Chromatic 🚀.

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Quality Gate passed

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[etanb]

nit: can we make the "900000" an integer?

[etanb]

Not sure how time is persisted in these tests, but is it worth cleaning up afterwards like so:

test.afterEach(async ({ page }) => {
    await page.clock.uninstall();
});