refactor: replace latest_finalized_hash with latest_finalized_header

[AlastairHolmes]

No description provided.

[codecov]

Codecov Report

Merging #4206 (10b0a99) into main (f6981d6) will increase coverage by 0%.
The diff coverage is 26%.

@@          Coverage Diff          @@
##            main   #4206   +/-   ##
=====================================
  Coverage     72%     72%           
=====================================
  Files        383     383           
  Lines      62348   62311   -37     
  Branches   62348   62311   -37     
=====================================
- Hits       44637   44631    -6     
+ Misses     15376   15344   -32     
- Partials    2335    2336    +1     

Files	Coverage Δ
...gine/src/state_chain_observer/sc_observer/tests.rs	88% <100%> (-<1%)	⬇️
engine/src/state_chain_observer/test_helpers.rs	100% <100%> (ø)
...chain_source/chunked_by_vault/deposit_addresses.rs	0% <0%> (ø)
...nked_chain_source/chunked_by_vault/egress_items.rs	0% <0%> (ø)
...tate_chain_observer/client/extrinsic_api/signed.rs	0% <0%> (ø)
engine/src/state_chain_observer/sc_observer/mod.rs	37% <29%> (ø)
engine/src/witness/eth.rs	0% <0%> (ø)
api/lib/src/queries.rs	20% <0%> (ø)
engine/src/witness/common/epoch_source.rs	0% <0%> (ø)
engine/src/state_chain_observer/client/mod.rs	24% <27%> (+1%)	⬆️

... and 5 files with indirect coverage changes

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