Add Container Cypress Test for updateContext

[ndricimrr]

We often forget to test both iframe and wc functionality, so need to make sure they always work even after updating functions.

• Add test for updateContext WC - based
• Add test for updateContext iFrame based
• Add test for compound scenario

Use existing test-app structure and avoid adding extra unnecessary files if not needed.

https://docs.luigi-project.io/docs/luigi-container-api?section=updatecontext

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This issue is part of #3757