Optimize `/register-signer` route by replacing ticker service with epoch service #7171

Job	Run time
build-test-wasm	1m 30s
build-open-api-ui	7s
build (macos-12)	2m 1s
build-docusaurus	1m 57s
build (macos-14)	1m 14s
build-ubuntu-X64	4m 17s
build (windows-latest)	10m 0s
cargo-doc	51s
check	1m 32s
test (ubuntu-22.04)	6m 38s
test (macos-12)	1m 50s
test (macos-14)	1m 26s
test (windows-latest)	2m 52s
build-test-explorer	1m 8s
publish-wasm-test (mithril-client-wasm)	57s
publish-docs	0s
e2e (std, thales, 9.0.0, 0, #1)	1m 18s
e2e (std, thales, 9.1.0, 0, #1)	1m 18s
e2e (std, thales, 9.1.1, 0, #1)	1m 18s
e2e (std, thales, 9.2.0, 0, #1)	1m 45s
e2e (std, thales, 9.2.1, 0, #1)	1m 39s
e2e (std, pythagoras, 9.0.0, 0, #1)	1m 29s
e2e (std, pythagoras, 9.1.0, 0, #1)	1m 21s
e2e (std, pythagoras, 9.1.1, 0, #1)	1m 20s
e2e (std, pythagoras, 9.2.0, 0, #1)	1m 37s
e2e (std, pythagoras, 9.2.1, 0, #1)	1m 33s
e2e (p2p, thales, 9.1.1, 0, #1, --use-p2p-network)	1m 26s
send-tests-results	18s
docker-mithril (mithril-aggregator)	19s
docker-mithril (mithril-client-cli)	16s
publish-crate-test (mithril-stm)	7s
docker-mithril (mithril-signer)	24s
publish-crate-test (mithril-build-script)	7s
docker-mithril (mithril-relay)	24s
publish-crate-test (mithril-common)	9s
unstable-release	0s
publish-crate-test (mithril-client)	8s
deploy-testing (testing-preview)	24s
deploy-testing (testing-sanchonet)	18s
	57m 18s

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