Simplify s3 functions: create_s3_bucket.

[DailyDreaming]

Making a series of many smaller PRs to simplify some of the AWS jobstore logic (like having retries on the imported functions themselves, rather than retyping the retries ad nauseam for every usage) out into generic callable AWS functions.

Changelog Entry

To be copied to the draft changelog by merger:

• Simplify s3 functions: create_s3_bucket.

Reviewer Checklist

• Make sure it is coming from issues/XXXX-fix-the-thing in the Toil repo, or from an external repo.
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    contrib/admin/test-pr otheruser theirbranchname issues/XXXX-fix-the-thing
    

  • If there is no associated issue, create one.
• Read through the code changes. Make sure that it doesn't have:
  • Addition of trailing whitespace.
  • New variable or member names in camelCase that want to be in snake_case.
  • New functions without type hints.
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• Comment on the lines of code where problems exist with a review comment. You can shift-click the line numbers in the diff to select multiple lines.
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Merger Checklist

• Make sure the PR passes tests.
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• Copy its recommended changelog entry to the Draft Changelog.
• Append the issue number in parentheses to the changelog entry.

[adamnovak]

Looks good to me!