Cherry-pick sst_importer: download SST from external storage + key rewrite (#5581)
to release-3.1
#5689
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What have you changed?
Cherry-pick #5581 to release-3.1.
What is the type of the changes?
Pick one of the following and delete the others:
How is the PR tested?
Does this PR affect documentation (docs) or should it be mentioned in the release notes?
No?
Does this PR affect
tidb-ansible
?No
Refer to a related PR or issue link (optional)
#5581
Benchmark result if necessary (optional)
Any examples? (optional)