Skip sha1sum verification for firmware files that were
provided via CH_CUSTOM_FIRMWARE or CH_CUSTOM_OVMF environment
variables. Custom files will not match the expected checksums,
so we filter them out of the sha1sums list before running
sha1sum --check.
Updated scripts:
- run_integration_tests_x86_64.sh
- run_integration_tests_aarch64.sh
Assisted-by: GitHub Copilot:Claude-Opus-4.6
Signed-off-by: Muminul Islam <muislam@microsoft.com>