Feat: add Cardano era retrieval in chain observer implementations #7510

Job	Run time
build (macos-14)	1m 46s
build-docusaurus	1m 45s
build-open-api-ui	7s
build (macos-14-large)	1m 53s
build-test-wasm	2m 12s
build (windows-latest)	4m 28s
build-ubuntu-X64	4m 47s
cargo-doc	49s
check	1m 51s
test (ubuntu-22.04)	7m 29s
test (macos-14)	1m 45s
test (macos-14-large)	1m 17s
test (windows-latest)	5m 16s
publish-wasm-test (mithril-client-wasm)	1m 13s
build-test-explorer	1m 9s
publish-docs	0s
e2e (std, thales, 9.1.1, 0, #1)	1m 16s
e2e (std, thales, 9.1.1, 0, #2)	1m 22s
e2e (std, thales, 9.2.1, 0, #1)	1m 21s
e2e (std, thales, 9.2.1, 0, #2)	2m 3s
e2e (std, thales, 10.1.2, 0, #1)	1m 28s
e2e (std, thales, 10.1.2, 0, #2)	1m 38s
e2e (std, pythagoras, 9.1.1, 0, #1)	1m 14s
e2e (std, pythagoras, 9.1.1, 0, #2)	1m 14s
e2e (std, pythagoras, 9.2.1, 0, #1)	1m 12s
e2e (std, pythagoras, 9.2.1, 0, #2)	1m 23s
e2e (std, pythagoras, 10.1.2, 0, #1)	1m 32s
e2e (std, pythagoras, 10.1.2, 0, #2)	1m 47s
e2e (p2p, thales, 9.2.1, 0, #1, --use-p2p-network)	1m 41s
e2e (std, thales, pythagoras, 9.2.1, 0, #1)	1m 52s
e2e (std, thales, pythagoras, 9.2.1, 0, #1, --mithril-era-regenesis-on-switch)	1m 51s
send-tests-results	16s
publish-crate-test (mithril-stm)	10s
docker-mithril (mithril-aggregator)	31s
publish-crate-test (mithril-build-script)	17s
unstable-release	0s
docker-mithril (mithril-client-cli)	29s
publish-crate-test (mithril-common)	15s
docker-mithril (mithril-signer)	30s
publish-crate-test (mithril-client)	7s
docker-mithril (mithril-relay)	27s
deploy-testing (testing-preview)	15s
deploy-testing (testing-sanchonet)	21s
	1h 4m 19s

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