fix(middleware-sdk-s3): safely access nested properties for error

[siddsriv]

Issue

#5554

Description

for region redirect middleware -- safely access nested properties for error, namely $metadata and httpStatusCode

Testing

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PASS  src/region-redirect-middleware.spec.ts (6.543 s)
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Test Suites: 9 passed, 9 total
Tests:       20 passed, 20 total
Snapshots:   0 total
Time:        6.868 s
Ran all test suites.
Done in 7.36s.

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