blob/s3blob: Allow using s3ForcePathStyle as a synonym of use_path_style, for backwards compatibility with V1

[vangent]

Fixes #3472.

[codecov]

Codecov Report

Attention: Patch coverage is 77.77778% with 2 lines in your changes missing coverage. Please review.

Project coverage is 73.25%. Comparing base (e9bda0a) to head (742f884).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
blob/s3blob/s3blob.go	77.77%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3505   +/-   ##
=======================================
  Coverage   73.24%   73.25%           
=======================================
  Files         113      113           
  Lines       15051    15052    +1     
=======================================
+ Hits        11024    11026    +2     
+ Misses       3262     3261    -1     
  Partials      765      765           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.