Fix: only flush temporary unreferenced streams #2035

Job	Run time
prepare	14s
build (php-8-2-27-alpine, linux/amd64)	8m 40s
build (php-8-2-27-alpine, linux/386)	8m 15s
build (php-8-2-27-alpine, linux/arm/v7)	4m 9s
build (php-8-2-27-alpine, linux/arm64)	3m 52s
build (php-8-2-27-bookworm, linux/amd64)	5m 4s
build (php-8-2-27-bookworm, linux/386)	7m 51s
build (php-8-2-27-bookworm, linux/arm/v7)	4m 2s
build (php-8-2-27-bookworm, linux/arm64)	3m 47s
build (php-8-3-16-alpine, linux/amd64)	5m 3s
build (php-8-3-16-alpine, linux/386)	7m 59s
build (php-8-3-16-alpine, linux/arm/v7)	4m 9s
build (php-8-3-16-alpine, linux/arm64)	7m 37s
build (php-8-3-16-bookworm, linux/amd64)	5m 0s
build (php-8-3-16-bookworm, linux/386)	4m 5s
build (php-8-3-16-bookworm, linux/arm/v7)	3m 57s
build (php-8-3-16-bookworm, linux/arm64)	7m 26s
build (php-8-4-3-alpine, linux/amd64)	5m 4s
build (php-8-4-3-alpine, linux/386)	8m 12s
build (php-8-4-3-alpine, linux/arm/v7)	4m 3s
build (php-8-4-3-alpine, linux/arm64)	4m 4s
build (php-8-4-3-bookworm, linux/amd64)	4m 52s
build (php-8-4-3-bookworm, linux/386)	4m 13s
build (php-8-4-3-bookworm, linux/arm/v7)	3m 54s
build (php-8-4-3-bookworm, linux/arm64)	3m 50s
push	0s
	2h 9m 22s

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