Modify debug migration s3 us-east-1 detections

[aemous]

Description of changes:

• Modify the us-east-1 S3 endpoint check so that:
  • It restricts the s3.amazonaws.com check to the hostname of the URL. This prevents false positives, for example, when the object key/prefix contains s3.amazonaws.com.
  • It does not trigger detection when --endpoint-url is used.
  • If the region is configured to something other than us-east-1, it will not trigger detection.
• Switch changelog entry from enhancement type to feature.

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[codecov-commenter]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 93.33%. Comparing base (5a98bdf) to head (49688a6). :warning: Report is 7 commits behind head on debug-migration.

Additional details and impacted files

@@               Coverage Diff                @@
##           debug-migration    #9906   +/-   ##
================================================
  Coverage            93.32%   93.33%           
================================================
  Files                  209      209           
  Lines                16909    16912    +3     
================================================
+ Hits                 15780    15784    +4     
+ Misses                1129     1128    -1     

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