fix: [branch-0.14] backport #3802 - cache object stores and bucket regions to reduce DNS query volume#3935
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Which issue does this PR close?
Backport of #3802 to branch-0.14.
Rationale for this change
PR #3802 fixes excessive DNS query volume caused by creating new object store instances repeatedly instead of caching them. This can cause operational issues in cloud deployments where DNS rate limiting is a concern.
What changes are included in this PR?
Cherry-pick of commit 7878f0d from main. The changes cache object stores and bucket regions to avoid redundant DNS lookups.
How are these changes tested?
Tests are included in the original PR and were cherry-picked along with the fix.