sst_importer: skip validation in ingest temporary (#7415) #7419
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cherry-pick #7415 to release-3.1
What problem does this PR solve?
Issue Number: close pingcap/br#163
Problem Summary:
What is changed and how it works?
This PR skip validation before ingest sst, so we can avoid panic since file length doesn't match.
Related changes
Check List
Tests
Side effects
Release note
bugfixes: Fix the issue that generate lots of empty region after restore.