ref(redis): Configure min_idle for the Redis pool #14656

Job	Run time
Lint	3m 14s
Test (macos-latest)	2m 26s
Test (windows-latest)	6m 26s
Setup build metadata	1s
Lint Rust Default Features	1m 39s
Test All Features (ubuntu-latest)	2m 34s
Integration Tests	12m 12s
Test Python	1m 11s
Build Relay Binary (relay, x86_64-unknown-linux-gnu)	7m 36s
Build Docker Image (relay)	34s
Sentry-Relay Integration Tests	3m 36s
self-hosted-end-to-end	3m 37s
Publish Relay to DockerHub	0s
Publish Relay to GCR	0s
Upload build artifacts to gocd	0s
	45m 6s

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