Remove network from `CardanoDbBeacon` #7596

Job	Run time
build-test-wasm	1m 39s
build-docusaurus	1m 48s
build (macos-14)	1m 35s
build-open-api-ui	12s
build (macos-14-large)	1m 46s
build (windows-latest)	2m 48s
build-ubuntu-X64	4m 30s
cargo-doc	40s
check	1m 58s
test (ubuntu-22.04)	4m 42s
test (macos-14)	1m 12s
test (macos-14-large)	1m 25s
test (windows-latest)	4m 21s
build-test-explorer	1m 17s
publish-wasm-test (mithril-client-wasm)	49s
publish-docs	0s
e2e	1s
send-tests-results	1s
publish-crate-test	1s
unstable-release	1s
docker-mithril	1s
deploy-testing	1s
	30m 48s

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