Add mocking for file preview

[osama-rizk]

Description of changes

Since we are using mocked data with no actual bucket in the storage browser, the file preview will always return an error. To avoid this, the getUrl function will be mocked.

Description of how you validated changes

• run the docs locally.

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.

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

[changeset-bot]

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Latest commit: cd9de51

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