cleanup feature

Best to explain the request with an example from a sample repo.

https://github.com/muratkeremozcan/appsyncmasterclass-backend/tree/main/cypress/e2e

The 3 spec files `image-upload`, `tweet`, `user-profile` all spin up a random user and get a token with it. At the end of each spec the user is cleaned up.

This would be a great use case for data session, however we have to delete the user at the end of each spec. If there was a feature to delete the user once, at the end, after all the specs have run, data-session would be more meaningful.

In theory we could try something in an after block in the e2e.ts, but that would require wrangling the variable, which would then also mean a before block would be necessary in the same file. You can imagine how that will be a mess to maintain with JS, multiple files, and common hooks in the e2e ts file. What if not every test requires these, for example the test `confirm-user-signup` in the repo? All this would be resolved if we could instead deal with the session for cleanup.

Review the sample repository's image-upload, tweet, and user-profile specs together with the shared e2e.ts hooks to understand how users and tokens are created and cleaned up. Define how data-session should perform one final cleanup after all relevant specs while leaving tests such as confirm-user-signup unaffected; done should be demonstrated with Cypress coverage for both cleanup paths.

Written by the indexing model from the issue text.