feat: Implement an Unknown variant in the artifact locations #8371

Job	Run time
build-open-api-ui	6s
build-docusaurus	1m 39s
build (macos-14)	1m 58s
build-test-wasm	2m 26s
build (windows-latest)	4m 53s
cargo-doc	56s
build-ubuntu-X64	4m 51s
check	1m 30s
test (ubuntu-24.04)	7m 21s
test (macos-14)	8m 43s
test (windows-latest)	3m 54s
build-test-explorer	1m 54s
publish-wasm-test (mithril-client-wasm)	1m 45s
publish-docs	0s
e2e (std, pythagoras, 10.1.3, 0, #1)	1m 21s
e2e (std, pythagoras, 10.1.3, 0, #2)	1m 31s
e2e (std, pythagoras, 10.1.4, 0, #1)	1m 36s
e2e (std, pythagoras, 10.1.4, 0, #2)	1m 27s
e2e (p2p, pythagoras, 10.1.4, 0, #1, --use-p2p-network)	2m 24s
e2e (std, pythagoras, 10.1.4, 0, #1, --mithril-era-regenesis-on-switch)	1m 11s
send-tests-results	17s
unstable-release	0s
publish-crate-test	0s
docker-mithril	0s
deploy-testing	0s
	51m 43s

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