fix: set file status "uploading" earlier

[nam-truong-le]

Description of changes

File status "uploading" should be set earlier as proposed here

Issue #, if available

https://github.com/aws-amplify/amplify-ui/issues/5800

Description of how you validated changes

Checklist

• [ ] Have read the Pull Request Guidelines
• [ ] PR description included
• [ ] yarn test passes and tests are updated/added
• [ ] PR title and commit messages follow conventional commit syntax
• [ ] If this change should result in a version bump, changeset added (This can be done after creating the PR.) This does not apply to changes made to docs, e2e, examples, or other private packages.

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