IRIS Video: stabilize stack switching & avoid duplicate heavy ops in --stack both, cleaner logs and safer Kodiak FW flow

[smuppand]

Introduces top-level vs sub-run gating in run.sh so heavy operations run once per --stack both execution:

• ensure_rootfs_min_size
• initial network bring-up (ensure_network_online)
• early media bundle fetch/extract

Adds robust post-stack capture in run.sh:

• video_dump_stack_state before/after
• whitespace-safe normalization of post_stack with fallback to video_stack_status when unknown

Keeps Kodiak firmware handling safe and minimal:

• upstream FW install done once per pass

• downstream reload only when requested/needed, with existing lib_video.sh helpers

• Preserves CLI and logic; no renames, no one-liners. Logging now explicitly states when sub-runs skip costly steps (e.g., “Sub-run: skipping rootfs size check”).

lib_video.sh enhancements leveraged:

• retrying modprobe, runtime block/unblock, persistent blacklist handling, V4L node refresh, FW swap/reload helpers

• functestlib.sh & YAML: no interface changes; existing helpers (check_dependencies, extract_tar_from_url, ensure_rootfs_min_size, scan_dmesg_errors) used as-is.

Verification

• Example --stack both run shows single early fetch, sub-runs skip heavy steps, clear pre/post module dumps, clean dmesg triage, and PASS for all tests in both passes.

Compatibility & Risk

• Backwards compatible flags and defaults.
• Writes to /etc/modprobe.d remain intentional and idempotent.
• Requires root for module ops (existing requirement).

[abbajaj806]

LGTM