Get kargs from usr/lib/bootc/kargs.d #4833

Job	Run time
cargo-deny	24s
test-integration-cfs (centos-10, composefs-sealeduki-sdboot)	29m 35s
validate	20m 19s
Test install	30m 42s
test-integration (centos-9)	1h 12m 57s
docs	2m 56s
test-integration (fedora-42)	1h 18m 6s
test-integration (fedora-43)	1h 18m 40s
test-integration (centos-10)	1h 5m 1s
required-checks	2s
	6h 18m 42s

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