refactor: rename `PohRecorder::is_same_fork_as_previous_leader` #18248

Job	Run time
cargo-test-sbf (associated-token-account)	6m 6s
cargo-test-sbf (feature-proposal)	5m 33s
cargo-test-sbf (instruction-padding)	5m 37s
check (associated-token-account)	1m 9s
test_cli (single-pool)	15m 24s
check (feature-proposal)	2m 57s
test_cli (token-2022)	19m 59s
check (instruction-padding)	56s
cargo-test-sbf (memo)	5m 16s
check (memo)	1m 31s
cargo-test-sbf (record)	6m 28s
check (record)	2m 21s
cargo-test-sbf (single-pool)	6m 32s
check (single-pool)	3m 49s
cargo-test-sbf (slashing)	11m 10s
check (slashing)	1m 12s
cargo-test-sbf (stake-pool)	9m 43s
check (stake-pool)	1m 37s
cargo-test-sbf (token-2022)	8m 24s
check (token-2022)	2m 8s
	1h 57m 52s

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