Submitter: fix backfill clamping + misc RPC selection fixes

[norswap]

Currently, our local node replica is fubared, it's lagging a few days behind the sequencer and making progress, albeit at a fraction of the normal pace.

This uncovered a bunch of interesting issues, and this is a first PR to address them.

• First, it showed that the backfill logic, which normally gets clamped to a max number of blocks (15 by default) wasn't operating because of a dumb operator precedence issue.
• Second, we didn't necessarily select an RPC that had made forward block progress during RPC selection.

This does not solve all the issues. We just haven't really considered this scenario where a RPC is live but largely trailing.

The main issue is not in the block subscription anymore, but in all the others RPC calls, which simply attempt to use the RPCs in the defined order, falling back in list order. The fix (for later) will be to implement a Viem client proxy that uses the RPC selected by the block service as its default block.

[norswap]

• Submitter: fix backfill clamping + misc RPC selection fixes #987 👈 (View in Graphite)
• master

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