update e2e test for storage access outputs

[rtpascual]

Changes

Follow up from this thread https://github.com/aws-amplify/amplify-backend/pull/1927#discussion_r1771848383. Added assertions to check shape of storage paths output.

Corresponding docs PR, if applicable:

Validation

e2e test

Checklist

• [ ] If this PR includes a functional change to the runtime behavior of the code, I have added or updated automated test coverage for this change.
• [ ] If this PR requires a change to the Project Architecture README, I have included that update in this PR.
• [ ] If this PR requires a docs update, I have linked to that docs PR above.
• [ ] If this PR modifies E2E tests, makes changes to resource provisioning, or makes SDK calls, I have run the PR checks with the run-e2e label set.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

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Latest commit: 891a1af28ee75c7f3e457062921160a14a2a335e

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