jetstream: fix test_race failures#18

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AlexCuse wants to merge 5 commits intoThreeDotsLabs:masterfrom

AlexCuse:jetstream-race-failure

Commits on Nov 15, 2023

simplify closer and restore unified make targets
AlexCuse
committed

Commits on Dec 5, 2023

temporarily use NATS client HEAD
AlexCuse
committed

Commits on Dec 7, 2023

guard channel closing w/ mutex + waitgroup
AlexCuse
committed

Commits on Dec 9, 2023

use messageWG to defer closure after stop
AlexCuse
committed

Commits on Jan 24, 2024

js drain
AlexCuse
committed