refactor(engine): update sync state for r/w hooks

[shekhirin]

Same idea as in #4657, but for the UpdateSyncState engine hook action.

It's correct, because when any hook acquires the exclusive DB write access, we should stop receiving the updates from CL:

reth/crates/consensus/beacon/src/engine/mod.rs

Lines 1695 to 1697 in d21fad2

	// If the hook has read-write access to the database, it means that the engine
	// can't process any FCU/payload messages from CL. To prevent CL from sending us
	// unneeded updates, we need to respond `true` on `eth_syncing` request.

[codecov]

Codecov Report

Merging #4687 (4191c80) into main (cf5d0e2) will decrease coverage by 0.04%.
The diff coverage is 60.00%.

Files Changed	Coverage Δ
crates/consensus/beacon/src/engine/hooks/mod.rs	62.50% <ø> (ø)
crates/consensus/beacon/src/engine/mod.rs	74.10% <55.55%> (-0.16%)	⬇️
crates/consensus/beacon/src/engine/hooks/prune.rs	85.71% <100.00%> (-1.30%)	⬇️

... and 11 files with indirect coverage changes

Flag	Coverage Δ
integration-tests	16.73% <0.00%> (-0.01%)	⬇️
unit-tests	63.30% <60.00%> (-0.04%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Components	Coverage Δ
reth binary	32.17% <ø> (ø)
blockchain tree	83.75% <ø> (ø)
pipeline	88.53% <ø> (ø)
storage (db)	72.52% <ø> (ø)
trie	94.73% <ø> (+0.03%)	⬆️
txpool	49.82% <ø> (ø)
networking	77.10% <ø> (-0.12%)	⬇️
rpc	57.83% <ø> (-0.01%)	⬇️
consensus	63.09% <60.00%> (-0.12%)	⬇️
revm	28.38% <ø> (ø)
payload builder	8.35% <ø> (ø)
primitives	86.51% <ø> (-0.04%)	⬇️

[mattsse]

lgtm, pending conflict