github: fix branch target name/version extraction logic #8354

Job	Run time
Code	8m 12s
System (1.22.x, cluster, dir)	13m 30s
Client (1.22.x, ubuntu-latest)	29s
Documentation	4m 41s
Client (1.22.x, macos-latest)	35s
System (1.22.x, cluster, btrfs)	13m 34s
Client (1.22.x, windows-latest)	2m 0s
System (1.22.x, cluster, lvm)	12m 59s
System (1.22.x, cluster, zfs)	12m 51s
System (1.22.x, cluster, ceph)	16m 44s
System (1.22.x, cluster, random)	14m 30s
System (1.22.x, standalone, dir)	25m 19s
System (1.22.x, standalone, btrfs)	23m 7s
System (1.22.x, standalone, lvm)	40m 38s
System (1.22.x, standalone, zfs)	42m 37s
System (1.22.x, standalone, ceph)	1h 17m 5s
System (1.22.x, standalone, random)	36m 44s
System (stable, cluster, dir)	11m 36s
System (stable, standalone, dir)	23m 47s
Trigger snap edge build	0s
	6h 20m 58s

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