Start scraper message_dispatch sync from high watermark #2377
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Description
This PR addresses an issue in which BSC RPC providers have a very hard time providing very old transactions.
This caused BSC scraping to fail, since the scraper had never actually indexed very early BSC messages (e.g. nonce 0).
By starting at the latest scraped nonce - 1, the scraper will bypass this issue.
Drive-by changes
None