dumpling: fix cannot dump data bug when dumpling fails to check has tikv (#40977) #41252
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This is an automated cherry-pick of #40977
What problem does this PR solve?
Issue Number: close #40932
Problem Summary: When dumpling fails to check has tikv(e.g: lack privileges), dumpling will set tidb_snapshot by default. For some cases setting this variable for connection will cause an error which will make dumpling stop to dump data.
What is changed and how it works?
When dumpling fails to check TiDB has TiKV,
ignore the error when we set tidb_snapshotnotify user to switch other consistency.Check List
Tests
Side effects
Documentation
Release note
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