[BUG][Tests] Cypress failing to verify csv and text downloads

[joshuali925]

What is the bug?
Specifically this line failed in cypress run for 2.9.0 https://github.com/opensearch-project/opensearch-dashboards-functional-test/blob/main/cypress/integration/plugins/query-workbench-dashboards/ui.spec.js#L214

Cypress error was expected undefined to be a string. possibly something changed in the API call that broke tests.

Manually verified that download csv and text file are working properly using 2.9.0 RC2.

How can one reproduce the bug?
Steps to reproduce the behavior:
opensearch-project/opensearch-build#3616 (comment)

What is the expected behavior?
A clear and concise description of what you expected to happen.

What is your host/environment?

• OS: [e.g. iOS]
• Version [e.g. 22]
• Plugins

Do you have any screenshots?
If applicable, add screenshots to help explain your problem.

Do you have any additional context?
Add any other context about the problem.