Resolves #6354

This PR renames GRAPH_GETH_ETH_CALL_ERRORS env var (and the internal config field) to GRAPH_RPC_ETH_CALL_ERRORS. This is a breaking change and should be noted in the release changelog and NEWS.md.

Initally I planned to make both available for a time and log a deprecation message, but after this PR #6355, which expanded the error list, I think renaming it right aways should be fine.