Small tweaks to the eth-rpc-tester bin

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Co-authored-by: cmd[bot] <41898282+github-actions[bot]@users.noreply.github.com>

- Fix a deadlock on the RWLock cache
- Remove eth-indexer, we won't need it anymore, the indexing will be
started from within eth-rpc directly

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Co-authored-by: cmd[bot] <41898282+github-actions[bot]@users.noreply.github.com>

#7463 follow up with RPC fixes

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Co-authored-by: cmd[bot] <41898282+github-actions[bot]@users.noreply.github.com>

- Add option to specify database_url using DATABASE_URL environment
variable
- Add a eth-rpc-tester rust bin that can be used to test deployment
before releasing eth-rpc
- make evm_block non fallible so that it can return an Ok response for
older blocks when the runtime API is not available
- update cargo.lock to integrate changes from
https://github.com/paritytech/subxt/pull/1904

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Co-authored-by: cmd[bot] <41898282+github-actions[bot]@users.noreply.github.com>