Provide latest immutable file number with certified ctx #5714

Job	Run time
build-open-api-ui	8s
build-test-wasm	1m 38s
build (macos-12)	2m 54s
build-docusaurus	1m 54s
build (windows-latest)	4m 1s
build-ubuntu-X64	3m 38s
cargo-doc	42s
check	59s
test (ubuntu-22.04)	6m 8s
test (macos-12)	2m 7s
test (windows-latest)	4m 46s
build-test-explorer	40s
publish-wasm-test (mithril-client-wasm)	56s
publish-docs	0s
e2e (std, thales, 8.7.3, 0, #1)	1m 8s
e2e (std, thales, 8.7.3, 0, #2)	1m 25s
e2e (std, thales, 8.7.3, 10, #1)	1m 17s
e2e (std, thales, 8.7.3, 10, #2)	1m 9s
e2e (std, thales, 8.7.3, 100, #1)	1m 17s
e2e (std, thales, 8.7.3, 100, #2)	1m 18s
e2e (std, thales, 8.1.2, 100, #1)	1m 21s
e2e (p2p, thales, 8.7.3, 100, #1, --use-p2p-network)	1m 10s
send-tests-results	14s
docker-mithril (mithril-aggregator)	28s
publish-crate-test (mithril-stm)	7s
docker-mithril (mithril-client-cli)	16s
unstable-release	0s
publish-crate-test (mithril-build-script)	10s
docker-mithril (mithril-signer)	21s
docker-mithril (mithril-relay)	29s
publish-crate-test (mithril-common)	7s
publish-crate-test (mithril-client)	8s
deploy-testing (testing-preview)	18s
deploy-testing (testing-sanchonet)	21s
	43m 35s

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