doc/byte_test: Document byte_test variable usage #937

Job	Run time
Prepare cbindgen	18s
Prepare dependencies	1m 21s
Fedora 38 (Suricata Verify codecov)	11m 59s
AlmaLinux 8	17m 3s
AlmaLinux 9 Test Templates	7m 25s
AlmaLinux 9 (no jansson)	1m 16s
AlmaLinux 9	16m 55s
Fedora 37 (clang, debug, asan, wshadow, rust-strict, systemd)	14m 57s
Fedora 37 (gcc, debug, asan, wshadow, rust-strict)	10m 58s
Fedora 37 (non-root, debug, clang, asan, wshadow, rust-strict, systemd)	13m 54s
Fedora 38 (clang, debug, asan, wshadow, rust-strict, systemd)	11m 55s
Fedora 38 (gcc, debug, asan, wshadow, rust-strict)	11m 15s
Ubuntu 22.04 (unittests coverage)	8m 59s
Debian 10	10m 19s
Debian 11 (xdp)	10m 51s
Debian 12	25m 22s
Debian 12 Dist Builder	4m 58s
Debian 12 MSRV	33m 9s
MacOS Latest	21m 10s
Ubuntu 20.04 (-DNDEBUG)	13m 26s
Ubuntu 22.04 (Cocci)	16m 55s
Ubuntu 22.04 (fuzz corpus coverage)	5m 58s
Ubuntu 22.04 (Debug Validation)	13m 38s
Ubuntu 22.04 (DPDK Build) (22.11.1)	21m 13s
Ubuntu 22.04 (DPDK Build) (21.11.3)	24m 1s
Ubuntu 22.04 (DPDK Build) (20.11.7)	14m 34s
Ubuntu 22.04 (DPDK Build) (19.11.14)	13m 28s
Ubuntu 22.04 (Fuzz)	8m 11s
Ubuntu 22.04 (Netmap build)	5m 6s
Windows MSYS2 MINGW64 (libpcap)	35m 47s
Windows MSYS2 MINGW64 (NPcap)	33m 4s
Windows MSYS2 MINGW64 (WinDivert)	20m 13s
Ubuntu 20.04 (unsupported rust)	2m 15s
CentOS 7	24m 34s
CentOS Stream 8	9m 20s
CentOS Stream 9	9m 21s
	8h 25m 8s

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