flow: Add cfg for optional flow reuse during low memory #8523

Job	Run time
Prepare dependencies	53s
Prepare cbindgen	18s
Fedora 38 (Suricata Verify codecov)	7m 6s
AlmaLinux 8	6m 31s
AlmaLinux 9 Test Templates	3m 11s
AlmaLinux 9	12m 29s
Fedora 38 (clang, debug, asan, wshadow, rust-strict, systemd)	6m 4s
AlmaLinux 9 (no jansson)	1m 35s
Fedora 38 (gcc, debug, asan, wshadow, rust-strict)	3m 13s
Fedora 39 (clang, debug, asan, wshadow, rust-strict, systemd)	2m 56s
Fedora 39 (gcc, debug, asan, wshadow, rust-strict)	3m 8s
Fedora 39 (non-root, debug, clang, asan, wshadow, rust-strict, systemd)	7m 54s
Ubuntu 22.04 (unittests coverage)	6m 5s
Debian 10	3m 23s
Debian 11 (xdp)	3m 40s
Debian 12	6m 49s
Debian 12 Dist Builder	4m 4s
Debian 12 MSRV	5m 53s
MacOS Latest	9m 20s
Ubuntu 20.04 (-DNDEBUG)	4m 36s
Ubuntu 22.04 (Debug Validation)	4m 19s
Ubuntu 22.04 (DPDK Build) (22.11.3)	6m 10s
Ubuntu 22.04 (fuzz corpus coverage)	4m 40s
Ubuntu 22.04 (DPDK Build) (21.11.5)	6m 32s
Ubuntu 22.04 (Fuzz)	6m 10s
Ubuntu 22.04 (DPDK Build) (20.11.9)	7m 11s
Ubuntu 22.04 (DPDK Build) (19.11.14)	7m 24s
Ubuntu 22.04 (Netmap build)	2m 54s
Windows MSYS2 MINGW64 (libpcap)	11m 9s
Windows MSYS2 MINGW64 (NPcap)	10m 45s
Windows MSYS2 MINGW64 (WinDivert)	10m 25s
CentOS Stream 9	3m 34s
CentOS Stream 8	3m 49s
CentOS 7	4m 11s
Ubuntu 20.04 (unsupported rust)	1m 30s
	3h 9m 51s

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