[v2] Auto-detect account regional namespace buckets in s3 mb#10212

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AndrewAsseily wants to merge 7 commits intov2from

s3-mb-account-regional-namespace

Commits on Apr 20, 2026

Simplify account-regional namespace detection to suffix check and address PR feedback
AndrewAsseily
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Add integration test for -an suffix bucket namespace header detection
AndrewAsseily
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Update unit tests to match simplified -an suffix detection
AndrewAsseily
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