Refactor - Makes loader-v4 the default #9857

Job	Run time
cargo-test-sbf (token/program)	7m 14s
check	2m 9s
cargo-test-sbf (instruction-padding/program, token/program-2022, token/program-2022-test)	14m 48s
test (token/cli, token/program, token/program-2022, associated-token-account/program, instruction...	14m 38s
cargo-test-sbf (associated-token-account/program, associated-token-account/program-test)	9m 25s
test (single-pool/cli, single-pool/program)	15m 0s
cargo-test-sbf (token-upgrade/program)	7m 31s
test (token-upgrade/cli, token-upgrade/program)	13m 11s
cargo-test-sbf (feature-proposal/program)	8m 50s
cargo-test-sbf (governance/addin-mock/program, governance/program)	11m 3s
cargo-test-sbf (memo/program)	7m 7s
cargo-test-sbf (name-service/program)	7m 59s
cargo-test-sbf (stake-pool/program)	10m 35s
cargo-test-sbf (single-pool/program)	7m 49s
	2h 17m 19s

Provide feedback