Fix flaky S3 bucket name generation in integration tests

[alexgromero]

Issue #, if available:

Description of changes:
Fixes flaky integration tests that were failing with BucketAlreadyExists errors when run concurrently.

Changes:

• Import random_bucket_name from awscli.testutils
• Replace manual bucket name generation with random_bucket_name(prefix) calls

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.33%. Comparing base (68039fa) to head (6e30318).
⚠️ Report is 311 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #9778      +/-   ##
===========================================
- Coverage    93.40%   93.33%   -0.07%     
===========================================
  Files          211      209       -2     
  Lines        17012    16807     -205     
===========================================
- Hits         15890    15687     -203     
+ Misses        1122     1120       -2     

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[Copilot]

Pull Request Overview

This PR fixes flaky integration tests that were experiencing BucketAlreadyExists errors when run concurrently by replacing manual bucket name generation with a more robust utility function.

• Import random_bucket_name utility from awscli.testutils
• Replace manual bucket name generation logic with random_bucket_name(prefix) calls
• Remove unused random import

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[AndrewAsseily]

LGTM