Remove loop from elapsed slots calculation #8340

Job	Run time
check	3m 13s
test (token/cli, token/program, token/program-2022, associated-token-account/program, instruction...	19m 23s
test (single-pool/cli, single-pool/program)	18m 44s
cargo-test-sbf (token/program)	7m 32s
test (token-upgrade/cli, token-upgrade/program)	17m 37s
cargo-test-sbf (instruction-padding/program, token/program-2022, token/program-2022-test)	14m 25s
cargo-test-sbf (associated-token-account/program, associated-token-account/program-test)	10m 17s
cargo-test-sbf (token-upgrade/program)	8m 44s
cargo-test-sbf (feature-proposal/program)	7m 56s
cargo-test-sbf (governance/addin-mock/program, governance/program)	11m 45s
cargo-test-sbf (memo/program)	7m 30s
cargo-test-sbf (name-service/program)	7m 19s
cargo-test-sbf (stake-pool/program)	10m 59s
cargo-test-sbf (single-pool/program)	9m 4s
	2h 34m 28s

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