Grant traced_probes search on directories.

This is needed to be able to scan the labels we have
permission on.

Denial:

04-06 12:52:22.674   874   874 W traced_probes: type=1400 audit(0.0:10314): avc: denied { search } for name="backup" dev="sda45" ino=6422529 scontext=u:r:traced_probes:s0 tcontext=u:object_r:backup_data_file:s0 tclass=dir permissive=0

Bug: 73625480