v1.18: ledger-tool: Set initial last full snapshot slot (backport of … #8117

Job	Run time
cargo-test-sbf (token/program)	8m 44s
check	0s
cargo-test-sbf (instruction-padding/program, token/program-2022, token/program-2022-test)	14m 52s
cargo-test-sbf (associated-token-account/program, associated-token-account/program-test)	11m 50s
test	0s
cargo-test-sbf (token-upgrade/program)	8m 53s
cargo-test-sbf (feature-proposal/program)	8m 37s
cargo-test-sbf (governance/addin-mock/program, governance/program)	12m 51s
cargo-test-sbf (memo/program)	8m 34s
cargo-test-sbf (name-service/program)	8m 36s
cargo-test-sbf (stake-pool/program)	12m 9s
cargo-test-sbf (single-pool/program)	9m 32s
	1h 44m 38s

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