fix: ETH getLogs: fix slowness at head and ignore null blocks #12207
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Temporary patch for the v1.28 release to fix some of the issues mentioned in #12205.
The right thing to do here is revisit how all the ETH RPC APIs deal with the "latest" flag and ensure they are "deferred execution-safe". We also need to make the Event Index aware of null blocks(or atleast have a way to ensure that a given height resulted in a null block and so it has already "processed" the events for that height). Let's prioritise this as part of our ETH RPC work.