Reorganize signer dependencies #6854

Job	Run time
build-open-api-ui	7s
build-test-wasm	1m 37s
build-docusaurus	1m 47s
build (macos-12)	4m 48s
build-ubuntu-X64	5m 9s
build (macos-14)	1m 37s
cargo-doc	1m 6s
build (windows-latest)	6m 39s
check	1m 36s
test (ubuntu-22.04)	6m 38s
test (macos-12)	1m 39s
test (macos-14)	1m 22s
test (windows-latest)	5m 59s
publish-wasm-test (mithril-client-wasm)	1m 3s
build-test-explorer	56s
publish-docs	0s
e2e (std, thales, 8.9.4, 0, #1)	1m 24s
e2e (std, thales, 8.12.2, 0, #1)	1m 12s
e2e (std, thales, 9.0.0, 0, #1)	1m 16s
e2e (std, thales, 9.1.0, 0, #1)	1m 14s
e2e (std, thales, 8.1.2, 100, #1)	1m 44s
e2e (p2p, thales, 8.9.4, 100, #1, --use-p2p-network)	1m 22s
e2e (std, thales, 8.9.4, 10, #1)	1m 19s
e2e (std, thales, 8.9.4, 100, #1)	1m 18s
send-tests-results	18s
publish-crate-test (mithril-stm)	18s
docker-mithril (mithril-aggregator)	25s
unstable-release	0s
docker-mithril (mithril-client-cli)	17s
publish-crate-test (mithril-build-script)	6s
publish-crate-test (mithril-common)	9s
docker-mithril (mithril-signer)	16s
publish-crate-test (mithril-client)	5s
docker-mithril (mithril-relay)	27s
deploy-testing (testing-preview)	17s
deploy-testing (testing-sanchonet)	22s
	55m 52s

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