Add --existing-hasura-url flag for indexer API in localnet #70370

Job	Run time
rust-consensus-only-smoke-test	0s
rust-consensus-only-unit-test	0s
rust-doc-tests	4m 39s
file_change_determinator	15s
rust-unit-tests	0s
rust-build-cached-packages	2m 5s
rust-cargo-deny	1m 45s
general-lints	29s
rust-check-merge-base	1m 10s
rust-lints	3m 39s
rust-cryptohasher-domain-separation-check	0s
rust-smoke-tests	27m 39s
rust-targeted-unit-tests	5m 17s
	46m 58s

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