fix: Do not override S3 region if already specified in configuration chain (backport release-3.6.x) - #20128
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Backport 0046bfb from #20127
Summary
The region (and other settings) for the S3 configuration can be specified in various ways.
When the region was already set by
LoadDefaultConfigit should not be set toInvalidAWSRegion.This is a follow up on #20110