[TieredStorage] Refactor file_size() code path (#400) #95

Job	Run time
check	0s
test	0s
cargo-test-sbf (token/program)	6m 30s
cargo-test-sbf (instruction-padding/program, token/program-2022, token/program-2022-test)	12m 31s
cargo-test-sbf (associated-token-account/program, associated-token-account/program-test)	9m 12s
cargo-test-sbf (token-upgrade/program)	8m 35s
cargo-test-sbf (feature-proposal/program)	6m 26s
cargo-test-sbf (governance/addin-mock/program, governance/program)	10m 35s
cargo-test-sbf (memo/program)	6m 28s
cargo-test-sbf (name-service/program)	7m 26s
cargo-test-sbf (stake-pool/program)	10m 37s
cargo-test-sbf (single-pool/program)	9m 29s
	1h 27m 49s

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