feat: add REDIS_USERNAME support for asynq client #229

Job	Run time
build-app (arm64, linux/arm64, ubuntu-24.04-arm)	5m 9s
build-sandbox	20s
build-docreader	2m 39s
build-ui	23s
build-app (amd64, linux/amd64, ubuntu-latest)	5m 34s
merge	14s
	14m 19s

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