Make sure that S3Uri are human readable when printed

[peternied]

Description

When running metadata command part of the output shows the S3 uri and it was not human readable.

Example updated output

S3Uri(bucketName=bucket-name, key=, uri=s3://bucket-name)
S3Uri(bucketName=bucket-name, key=, uri=s3://bucket-name)
S3Uri(bucketName=bucket-name, key=with/suffix, uri=s3://bucket-name/with/suffix)
S3Uri(bucketName=bucket-name, key=with/suffix, uri=s3://bucket-name/with/suffix)

Example error case

Starting Metadata Evaluation
Clusters:
   Source:
      Snapshot: ELASTICSEARCH 7.10.0 S3Repo(s3RepoUri=org.opensearch.migrations.bulkload.common.S3Uri@639cb788)

Issues Resolved

N/A

Testing

N/A Simple UX change

Check List

• New functionality includes testing
• Public documentation issue/PR created, if applicable.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.63%. Comparing base (3d6b0ad) to head (7c90b41).
Report is 2 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #1205      +/-   ##
============================================
- Coverage     80.64%   80.63%   -0.01%     
  Complexity     3076     3076              
============================================
  Files           421      421              
  Lines         15610    15611       +1     
  Branches       1053     1053              
============================================
  Hits          12588    12588              
- Misses         2381     2382       +1     
  Partials        641      641              

Flag	Coverage Δ
unittests	80.63% <ø> (-0.01%)	⬇️

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