refactor(en): Fetch old l1 batch hashes from L1 – metrics #2131
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What ❔
Adds a couple of metrics / logs for tree data fetcher related to fetching data from L1. Follow-up after #2000.
Why ❔
These metrics / logs would allow to track tree data fetcher health more thoroughly.
Checklist
zk fmt
andzk lint
.zk spellcheck
.