Apply cleanups to solana-core for unified scheduler #15205

Job	Run time
cargo-test-sbf (token/program)	8m 24s
cargo-test-sbf (instruction-padding/program, token/program-2022, token/program-2022-test)	12m 49s
cargo-test-sbf (associated-token-account/program, associated-token-account/program-test)	9m 42s
cargo-test-sbf (token-upgrade/program)	8m 21s
check	2m 11s
cargo-test-sbf (feature-proposal/program)	7m 57s
test (token/cli, token/program, token/program-2022, associated-token-account/program, instruction...	16m 2s
cargo-test-sbf (governance/addin-mock/program, governance/program)	9m 49s
test (single-pool/cli, single-pool/program)	14m 4s
cargo-test-sbf (name-service/program)	8m 42s
test (token-upgrade/cli, token-upgrade/program)	14m 33s
cargo-test-sbf (stake-pool/program)	10m 57s
cargo-test-sbf (single-pool/program)	8m 43s
	2h 12m 14s

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