test: disable LSan in the ASan env wrapper

This wrapper is used in situations where  we don't care about *San reports,
we just want to make things work. However, with enabled LSan we might
trigger some bogus reports we're definitely not interested in, causing
unexpected test fails.

Spotted on C8S in TEST-34-DYNAMICUSERMIGRATE:
```
[10654.804162] testsuite-34.sh[56]: + systemctl start testservice-34-check-writable.service
         Starting testservice-34-check-writable.service...
[10655.055969] bash[546]: + set -o pipefail
[10655.056127] bash[546]: + declare -a writable_dirs
[10655.056234] bash[546]: + readarray -t writable_dirs
[10655.060838] bash[548]: ++ find / '(' -path /var/tmp -o -path /tmp -o -path /proc -o -path /dev/mqueue -o -path /dev/shm -o -path /sys/fs/bpf -o -path /dev/.lxc -o -path /sys/devices/system/cpu ')' -prune -o -type d -writable -print
[10655.061534] bash[549]: ++ sort -u
[10655.688740] bash[547]: =================================================================
[10655.689075] bash[547]: ==547==ERROR: LeakSanitizer: detected memory leaks
[10655.689246] bash[547]: Direct leak of 112 byte(s) in 1 object(s) allocated from:
[10655.743851] bash[547]:     #0 0x7ffff752d364  (/usr/lib64/clang/14.0.0/lib/libclang_rt.asan-powerpc64le.so+0x13d364) (BuildId: 321f4ed1caea6a1a4c37f9272e07275cf16f034d)
[10655.744060] bash[547]:     #1 0x1000b5d20 in xmalloc (/usr/bin/bash+0xb5d20) (BuildId: da38eb38f6870bdc2a6ef51c52aa6ce20921fe40)
[10655.744224] bash[547]:     #2 0x100083338  (/usr/bin/bash+0x83338) (BuildId: da38eb38f6870bdc2a6ef51c52aa6ce20921fe40)
[10655.744393] bash[547]:     #3 0x10008847c  (/usr/bin/bash+0x8847c) (BuildId: da38eb38f6870bdc2a6ef51c52aa6ce20921fe40)
[10655.744552] bash[547]:     #4 0x1000af6ec in redirection_expand (/usr/bin/bash+0xaf6ec) (BuildId: da38eb38f6870bdc2a6ef51c52aa6ce20921fe40)
[10655.744728] bash[547]:     #5 0x1000b005c  (/usr/bin/bash+0xb005c) (BuildId: da38eb38f6870bdc2a6ef51c52aa6ce20921fe40)
[10655.744886] bash[547]:     #6 0x1000b1388 in do_redirections (/usr/bin/bash+0xb1388) (BuildId: da38eb38f6870bdc2a6ef51c52aa6ce20921fe40)
[10655.745051] bash[547]:     #7 0x100050484  (/usr/bin/bash+0x50484) (BuildId: da38eb38f6870bdc2a6ef51c52aa6ce20921fe40)
[10655.745208] bash[547]:     #8 0x100052160 in execute_command_internal (/usr/bin/bash+0x52160) (BuildId: da38eb38f6870bdc2a6ef51c52aa6ce20921fe40)
[10655.745376] bash[547]:     #9 0x100052a10 in execute_command_internal (/usr/bin/bash+0x52a10) (BuildId: da38eb38f6870bdc2a6ef51c52aa6ce20921fe40)
[10655.745536] bash[547]:     #10 0x100053e38 in execute_command (/usr/bin/bash+0x53e38) (BuildId: da38eb38f6870bdc2a6ef51c52aa6ce20921fe40)
[10655.745711] bash[547]:     #11 0x1000529d8 in execute_command_internal (/usr/bin/bash+0x529d8) (BuildId: da38eb38f6870bdc2a6ef51c52aa6ce20921fe40)
[10655.745870] bash[547]:     #12 0x100053e38 in execute_command (/usr/bin/bash+0x53e38) (BuildId: da38eb38f6870bdc2a6ef51c52aa6ce20921fe40)
[10655.746038] bash[547]:     #13 0x1000529d8 in execute_command_internal (/usr/bin/bash+0x529d8) (BuildId: da38eb38f6870bdc2a6ef51c52aa6ce20921fe40)
[10655.746198] bash[547]:     #14 0x100053e38 in execute_command (/usr/bin/bash+0x53e38) (BuildId: da38eb38f6870bdc2a6ef51c52aa6ce20921fe40)
[10655.746367] bash[547]:     #15 0x1000529d8 in execute_command_internal (/usr/bin/bash+0x529d8) (BuildId: da38eb38f6870bdc2a6ef51c52aa6ce20921fe40)
[10655.746548] bash[547]:     #16 0x100053e38 in execute_command (/usr/bin/bash+0x53e38) (BuildId: da38eb38f6870bdc2a6ef51c52aa6ce20921fe40)
[10655.746741] bash[547]:     #17 0x1000529d8 in execute_command_internal (/usr/bin/bash+0x529d8) (BuildId: da38eb38f6870bdc2a6ef51c52aa6ce20921fe40)
[10655.746897] bash[547]:     #18 0x100053e38 in execute_command (/usr/bin/bash+0x53e38) (BuildId: da38eb38f6870bdc2a6ef51c52aa6ce20921fe40)
[10655.747067] bash[547]:     #19 0x1000529d8 in execute_command_internal (/usr/bin/bash+0x529d8) (BuildId: da38eb38f6870bdc2a6ef51c52aa6ce20921fe40)
[10655.747227] bash[547]:     #20 0x100053e38 in execute_command (/usr/bin/bash+0x53e38) (BuildId: da38eb38f6870bdc2a6ef51c52aa6ce20921fe40)
[10655.747414] bash[547]:     #21 0x1000529d8 in execute_command_internal (/usr/bin/bash+0x529d8) (BuildId: da38eb38f6870bdc2a6ef51c52aa6ce20921fe40)
[10655.747573] bash[547]:     #22 0x100053e38 in execute_command (/usr/bin/bash+0x53e38) (BuildId: da38eb38f6870bdc2a6ef51c52aa6ce20921fe40)
[10655.747741] bash[547]:     #23 0x1000529d8 in execute_command_internal (/usr/bin/bash+0x529d8) (BuildId: da38eb38f6870bdc2a6ef51c52aa6ce20921fe40)
[10655.747896] bash[547]:     #24 0x100053e38 in execute_command (/usr/bin/bash+0x53e38) (BuildId: da38eb38f6870bdc2a6ef51c52aa6ce20921fe40)
[10655.748064] bash[547]:     #25 0x1000529d8 in execute_command_internal (/usr/bin/bash+0x529d8) (BuildId: da38eb38f6870bdc2a6ef51c52aa6ce20921fe40)
[10655.748225] bash[547]:     #26 0x100053e38 in execute_command (/usr/bin/bash+0x53e38) (BuildId: da38eb38f6870bdc2a6ef51c52aa6ce20921fe40)
[10655.748390] bash[547]:     #27 0x1000529d8 in execute_command_internal (/usr/bin/bash+0x529d8) (BuildId: da38eb38f6870bdc2a6ef51c52aa6ce20921fe40)
[10655.748553] bash[547]:     #28 0x1000bf91c in parse_and_execute (/usr/bin/bash+0xbf91c) (BuildId: da38eb38f6870bdc2a6ef51c52aa6ce20921fe40)
[10655.748717] bash[547]:     #29 0x1000311ec  (/usr/bin/bash+0x311ec) (BuildId: da38eb38f6870bdc2a6ef51c52aa6ce20921fe40)
[10655.748883] bash[547]: Direct leak of 17 byte(s) in 1 object(s) allocated from:
...
```

(cherry picked from commit b8dd276)

test/test-functions

@@ -810,6 +810,7 @@ DEFAULT_ENVIRONMENT="ASAN_OPTIONS=\$DEFAULT_ASAN_OPTIONS UBSAN_OPTIONS=\$DEFAULT
 cat >/usr/lib/systemd/systemd-asan-env <<INNER_EOF
 LD_PRELOAD=$ASAN_RT_PATH
 ASAN_OPTIONS=$DEFAULT_ASAN_OPTIONS
+LSAN_OPTIONS=detect_leaks=0
 UBSAN_OPTIONS=$DEFAULT_UBSAN_OPTIONS
 INNER_EOF