feat(proxyd): prevent banning out-of-sync backend

[felipe-op]

Description

This change relaxes the ban logic in case of a backend that is syncing.

Our current default ban time is 5min, and sync may need only a few seconds.

On 2023-05-11 we observed a 1-block depth reorg which caused alchemy to get banned because it reported out of sync when fetching blocks.

{"backend":"alchemy","lvl":"warn","msg":"backend banned - not in sync","t":"2023-05-11T13:29:17.970613807Z"}

{"blockHash":"0x6e18493498040a4edc3d3fa755be422731124fc9d34f1f807ffcb229044413ae","blockNum":"0x890c41","lvl":"warn","msg":"backend broke consensus","name":"alchemy","proposedBlockHash":"0x159b0327000e4c7eec00aee78e548888a3b0187055a8cabd7b524c3d05053e94","proposedBlockNum":"0x890c41","t":"2023-05-11T13:23:29.424361286Z"}

Tests

Added ban checks.

Invariants

n/a

Additional context

This is part of the project Consensus Aware RPC Proxy: https://www.notion.so/oplabs/Consensus-Aware-RPC-Proxy-0138e029af814e4cbca2740c7888e02d

Metadata

• Fixes INF-221

TODOs

• Author or reviewer has added an entry to the current release notes draft, if appropriate -- not applicable

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[codecov]

Codecov Report

Merging #5694 (d7033e6) into develop (1382586) will increase coverage by 0.19%.
The diff coverage is n/a.

❗ Current head d7033e6 differs from pull request most recent head 25dd1ce. Consider uploading reports for the commit 25dd1ce to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #5694      +/-   ##
===========================================
+ Coverage    38.91%   39.10%   +0.19%     
===========================================
  Files          312      287      -25     
  Lines        25176    24431     -745     
  Branches       116        0     -116     
===========================================
- Hits          9797     9554     -243     
+ Misses       14483    13981     -502     
  Partials       896      896              

Flag	Coverage Δ
bedrock-go-tests	39.10% <ø> (+<0.01%)	⬆️
common-ts-tests	?
dtl-tests	?
fault-detector-tests	?

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see 28 files with indirect coverage changes

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