ccl/sqlproxyccl: fix TestConnectionMigration test flake #83457
Merged
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Fixes #83096.
It appears that database/sql does not provide any thread-safe guarantees for
methods on the Conn type except the Close method. This commit fixes a test-only
issue that causes a panic when there's a race between internal Conn methods
by ensuring that Conn methods are used in a single-threaded way.
Release note: None
Release justification: sqlproxy only test change.