v1.18: Purges all bank snapshots after fastboot (backport of #35350) #7916

Job	Run time
check	0s
cargo-test-sbf (token/program)	9m 40s
cargo-test-sbf (instruction-padding/program, token/program-2022, token/program-2022-test)	15m 43s
test	0s
cargo-test-sbf (associated-token-account/program, associated-token-account/program-test)	10m 50s
cargo-test-sbf (token-upgrade/program)	9m 1s
cargo-test-sbf (feature-proposal/program)	9m 21s
cargo-test-sbf (governance/addin-mock/program, governance/program)	14m 59s
cargo-test-sbf (memo/program)	8m 39s
cargo-test-sbf (name-service/program)	8m 39s
cargo-test-sbf (stake-pool/program)	13m 3s
cargo-test-sbf (single-pool/program)	10m 29s
	1h 50m 24s

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