chore: refactor L1BlockInfo::tx_estimated_size_fjord (#1862) #4516

Job	Run time
docs	1m 15s
check no_std	21s
clippy	1m 19s
check no_std optimism,kzg-rs	23s
check	17s
fmt	10s
check serde	21s
check std	17s
test stable --no-default-features	1m 11s
TyposCheck	8s
test stable	49s
test stable --all-features	1m 33s
test beta --no-default-features	55s
test beta	54s
test beta --all-features	1m 38s
test nightly --no-default-features	48s
test nightly	53s
test nightly --all-features	1m 36s
	14m 48s

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