ls: Fix excessive ls -al syscalls for ACL metadata

[kimono-koans]

Reduces syscalls by searching for the specific ACL xattr key instead of requesting a list of all keys and values.

Fixes: #8350

➜  ~ strace -c ./program/coreutils/target/release/ls -al
...
% time     seconds  usecs/call     calls    errors syscall
------ ----------- ----------- --------- --------- ------------------
 20.88    0.001559          11       130           listxattr
 16.02    0.001196          35        34           getdents64
 14.43    0.001077          13        79         9 statx
 10.89    0.000813         813         1           execve
  6.47    0.000483          17        28         1 openat
  4.65    0.000347          11        31           close
  4.21    0.000314          24        13           mmap
  4.07    0.000304          23        13           read
  3.99    0.000298          11        27           fstat
  3.03    0.000226          16        14         6 readlink
  1.81    0.000135          33         4         4 connect
  1.62    0.000121          30         4           socket
  1.25    0.000093          93         1           write
  1.11    0.000083          13         6           newfstatat
  0.90    0.000067          11         6           brk
  0.64    0.000048           6         7           rt_sigaction
  0.60    0.000045           9         5           mprotect
  0.58    0.000043           8         5           lseek
  0.58    0.000043           8         5           ioctl
  0.50    0.000037          18         2           munmap
  0.46    0.000034          17         2           pread64
  0.31    0.000023           7         3           sigaltstack
  0.25    0.000019          19         1         1 access
  0.15    0.000011           5         2           getrandom
  0.13    0.000010          10         1           arch_prctl
  0.11    0.000008           8         1           sched_getaffinity
  0.11    0.000008           8         1           set_tid_address
  0.11    0.000008           8         1           set_robust_list
  0.11    0.000008           8         1           rseq
  0.07    0.000005           2         2           prlimit64
  0.00    0.000000           0         1           poll
------ ----------- ----------- --------- --------- ------------------
100.00    0.007466          17       431        21 total

➜  ~ strace -c ./program/coreutils/target/release/ls -al
...
% time     seconds  usecs/call     calls    errors syscall
------ ----------- ----------- --------- --------- ------------------
 19.08    0.000962          28        34           getdents64
 17.12    0.000863          10        79         9 statx
 16.20    0.000817         817         1           execve
  8.67    0.000437          15        28         1 openat
  6.41    0.000323          24        13           mmap
  5.28    0.000266           4        66        66 getxattr
  4.20    0.000212           7        27           fstat
  4.17    0.000210          16        13           read
  3.91    0.000197           6        31           close
  3.35    0.000169          12        14         6 readlink
  2.42    0.000122          24         5           mprotect
  1.94    0.000098          16         6           brk
  1.21    0.000061           8         7           rt_sigaction
  1.03    0.000052          10         5           ioctl
  0.87    0.000044          22         2           munmap
  0.65    0.000033          16         2           pread64
  0.46    0.000023          11         2           getrandom
  0.42    0.000021           3         6           newfstatat
  0.38    0.000019           9         2           prlimit64
  0.36    0.000018          18         1         1 access
  0.36    0.000018           6         3           sigaltstack
  0.34    0.000017          17         1           poll
  0.34    0.000017           3         5           lseek
  0.22    0.000011          11         1           sched_getaffinity
  0.18    0.000009           9         1           arch_prctl
  0.16    0.000008           8         1           set_tid_address
  0.16    0.000008           8         1           rseq
  0.14    0.000007           7         1           set_robust_list
  0.00    0.000000           0         1           write
  0.00    0.000000           0         4           socket
  0.00    0.000000           0         4         4 connect
------ ----------- ----------- --------- --------- ------------------
100.00    0.005042          13       367        87 total

[github-actions]

GNU testsuite comparison:

Skip an intermittent issue tests/misc/tee (fails in this run but passes in the 'main' branch)
Note: The gnu test tests/ls/no-cap is now being skipped but was previously passing.

[github-actions]

GNU testsuite comparison:

Note: The gnu test tests/ls/no-cap is now being skipped but was previously passing.

[github-actions]

GNU testsuite comparison:

Note: The gnu test tests/ls/no-cap is now being skipped but was previously passing.

[github-actions]

GNU testsuite comparison:

Skip an intermittent issue tests/misc/tee (fails in this run but passes in the 'main' branch)
Note: The gnu test tests/ls/no-cap is now being skipped but was previously passing.

[github-actions]

GNU testsuite comparison:

Skip an intermittent issue tests/tail/overlay-headers (fails in this run but passes in the 'main' branch)
Note: The gnu test tests/ls/no-cap is now being skipped but was previously passing.

[github-actions]

GNU testsuite comparison:

Skip an intermittent issue tests/tail/overlay-headers (fails in this run but passes in the 'main' branch)
Note: The gnu test tests/ls/no-cap is now being skipped but was previously passing.

[github-actions]

GNU testsuite comparison:

Skipping an intermittent issue tests/tail/overlay-headers (passes in this run but fails in the 'main' branch)
Note: The gnu test tests/ls/no-cap is now being skipped but was previously passing.

[github-actions]

GNU testsuite comparison:

Note: The gnu test tests/ls/no-cap is now being skipped but was previously passing.

[github-actions]

GNU testsuite comparison:

Note: The gnu test tests/ls/no-cap is now being skipped but was previously passing.

[Ecordonnier]

@kimono-koans are you still working on the branch?

[oech3]

conflicting

[Ecordonnier]

please reopen when ready