test(middleware-sdk-s3): add waiter for objects in s3 express e2e test

[siddsriv]

Issue

Internal JS-5161

Description

adds a waiter for objects to exist

Testing

 PASS  packages/middleware-sdk-s3/src/s3-express/middleware-s3-express.e2e.spec.ts (6.363 s)
  s3 express CRUD test suite
    ✓ can create a bucket (2 ms)
    ✓ can read/write/delete from a bucket (1 ms)
    ✓ can presign get (74 ms)
    ○ skipped can presign put

Test Suites: 1 passed, 1 total
Tests:       1 skipped, 3 passed, 4 total
Snapshots:   0 total
Time:        6.416 s
Ran all test suites matching /middleware-s3-express.e2e.spec.ts/i.

Additional context

Add any other context about the PR here.

Checklist

• If you wrote E2E tests, are they resilient to concurrent I/O?

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[trivikr]

The ObjectExists waiter should be added before calling getObject

[siddsriv]

closing this PR since Amazon S3 has strong consistency for objects. A waiter is probably not needed for objects here.

[github-actions]

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