v1.18: Revert deprecate executable feature (backport of #309) #976

Job	Run time
cargo-test-sbf (token/program)	9m 23s
cargo-test-sbf (instruction-padding/program, token/program-2022, token/program-2022-test)	15m 7s
test	0s
cargo-test-sbf (associated-token-account/program, associated-token-account/program-test)	9m 12s
check	0s
cargo-test-sbf (token-upgrade/program)	14m 52s
cargo-test-sbf (feature-proposal/program)	9m 52s
cargo-test-sbf (governance/addin-mock/program, governance/program)	12m 38s
cargo-test-sbf (memo/program)	7m 40s
cargo-test-sbf (name-service/program)	9m 8s
cargo-test-sbf (stake-pool/program)	13m 25s
cargo-test-sbf (single-pool/program)	9m 45s
	1h 51m 2s

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