Ensure we are getting FileEntry type

[ShadowCat567]

Problem

@zip.js/zip.js released a new version where they removed the getData property from the DirectoryEntry type. The DirectoryEntry type is part of the type union that makes up the type Entry. Since we do ensure we are getting FileEntry in this integration test, then the removal of the getData field from the DirectoryEntry type means that typescript isn't sure whether we have a FileEntry or a DirectoryEntry when we get to entry.getData!(new TextWriter()) so it throws an error because getData is only defined for the FileEntry type.

Issue number, if available:

Changes

Since we are expecting the file index.mjs to have type FileEntry, we assert that the directory property is set to false.

Corresponding docs PR, if applicable:

Validation

Successful canary run: https://github.com/aws-amplify/amplify-backend/actions/runs/17562239264

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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