test: re-enable flaky OpenUI5 Dialog + nested WebC ResponsivePopover test

[nnaydenow]

The following test was temporarily skipped in #13656 due to flakiness on CI:

• File: packages/main/cypress/specs/OpenUI5andWebCPopups.openUI5DialogWebCDialog.cy.tsx
• Test: OpenUI5 Dialog: opening nested WebC ResponsivePopover and closing both with Escape
• Error: Timed out retrying after 4000ms: expected '<ui5-responsive-popover#respPopover>' to have attribute 'open'

[GDamyanov]

Hello @UI5/ui5-team-ctr-rod,

Could you take a look on skipped test?

Kind Regards,
Georgi

[github-actions]

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