Fix `__new__` parameter names of S3

Zehao Chenrequested to merge
zchen723/fix-s3-timeout-parser into master

Before raising this MR, consider whether the following are required, and complete if so:

  • Unit tests
  • Metrics
  • Documentation update(s)

Description

This short MR fixes the differences between fields of S3Storage and __new__ of it's parser. The schema validates names without s3_ prefix as shown here: https://gitlab.com/BuildGrid/buildgrid/-/blob/master/buildgrid/_app/settings/schemas/storage/s3.yaml?ref_type=heads

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