OCPBUGS:105601: Fix output directories collision.

[jmesnil]

Output directories were created with 0o777 permissions and named using only subsec_nanos (0–999999999), risking collisions when two scans start in the same fractional second.

• Add mode parameter to create_dir with named constants (SCAN_DIR_MODE 0o700, CONTAINER_DIR_MODE 0o770) instead of hardcoded 0o777
• Use as_nanos() (full u128 timestamp) instead of subsec_nanos() for the scan directory name
• chown per-container output dirs to the target UID so the child process can still write after seteuid

JIRA: https://redhat.atlassian.net/browse/OCPBUGS-105601

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