Implement fake aggregator in wasm tests #5108

Job	Run time
build-test-wasm	2m 45s
build-test-wasm	2m 45s
build-open-api-ui	8s
build-open-api-ui	8s
build-docusaurus	3m 14s
build-docusaurus	3m 14s
build (macos-12)	11m 51s
build (macos-12)	11m 51s
build (windows-latest)	13m 36s
build (windows-latest)	13m 36s
build-ubuntu-X64	10m 7s
build-ubuntu-X64	10m 7s
cargo-doc	6m 40s
cargo-doc	6m 40s
check	3m 54s
check	3m 54s
test (ubuntu-22.04)	8m 14s
test (ubuntu-22.04)	7m 26s
test (macos-12)	5m 4s
test (macos-12)	5m 4s
test (windows-latest)	7m 20s
test (windows-latest)	7m 20s
publish-wasm-test (mithril-client-wasm)	1m 47s
publish-wasm-test (mithril-client-wasm)	1m 47s
build-test-explorer	1m 11s
build-test-explorer	1m 11s
publish-docs	0s
publish-docs	0s
publish-tests-results	19s
publish-tests-results	14s
run-test-lab (thales, 1, 1000)	1m 7s
run-test-lab (thales, 1, 1000)	1m 7s
run-test-lab (thales, 2, 1000)	59s
run-test-lab (thales, 2, 1000)	59s
run-test-lab (thales, 3, 1000)	1m 6s
run-test-lab (thales, 3, 1000)	1m 6s
run-test-lab (thales, 3, 1000, --use-p2p-network)	2m 32s
run-test-lab (thales, 3, 1000, --use-p2p-network)	58s
unstable-release	0s
unstable-release	0s
docker-mithril	0s
publish-crate-test	0s
deploy-testing	0s
docker-mithril (mithril-aggregator)	19s
docker-mithril (mithril-client-cli)	17s
publish-crate-test (mithril-stm)	8s
docker-mithril (mithril-signer)	19s
publish-crate-test (mithril-common)	9s
docker-mithril (mithril-relay)	29s
publish-crate-test (mithril-client)	8s
deploy-testing (testing-preview)	22s
	2h 43m 32s

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