test: refactor connection handoff tests with enhanced spy utility#2

PavelPashov merged 1 commit intohitless-upgrades-more-e2e-testsPavelPashov/node-redis:hitless-upgrades-more-e2e-testsfrom

hitless-upgrades-refactor-connection-testsPavelPashov/node-redis:hitless-upgrades-refactor-connection-testsCopy head branch name to clipboard