e2e test - Publisher Test with Shiny App

[rodrigosf672]

• This test verifies the functionality of publishing a Shiny app to Posit Connect through Positron.
• These changes enhance the testing framework's ability to validate deployment workflows.
• After test is over, regardless of outcome, created files for user are deleted from Posit Connect to ensure clean-up.
• This test can also be useful for future attempts to access and click on elements on the left pane, by exploring the iframe --> iframe --> shadow DOM penetration, which played a crucial role for this E2E test.

QA Notes

@:web @:win @:publisher

[github-actions[bot]]

E2E Tests 🚀 This PR will run tests tagged with: @:critical @:web @:win @:publisher

^{readme  valid tags}

[rodrigosf672]

@testlabauto All seems good now! @midleman If all looks good to you, can you please review so that the merging block? Thanks!

[rodrigosf672]

@testlabauto @midleman This is ready to be merged, after final review.

[rodrigosf672]

@midleman Thank you so much for the additional feedback; I have implemented the changes you have suggested. @testlabauto All checks have passed, waiting for your approval to merge.