Refactor tests to use `createAlert` part 2

What does this MR do and why?

These tests are not working as expected because their callback functions are not invoked.

Part of Bulk replacement of `createFlash` by `createAlert` (#366396 - closed)

More context: We have been replacing all the createFlash for the Pajama compliant createAlert. We realised there were still tests using createFlash while their corresponding files were migrated to use createAlert. The tests were still passing because the expect statement were not executed.

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