Refactor - Makes loader-v4 the default #9906

Job	Run time
check	2m 46s
cargo-test-sbf (token/program)	7m 57s
test (token/cli, token/program, token/program-2022, associated-token-account/program, instruction...	8m 3s
cargo-test-sbf (instruction-padding/program, token/program-2022, token/program-2022-test)	7m 56s
test (single-pool/cli, single-pool/program)	7m 59s
cargo-test-sbf (associated-token-account/program, associated-token-account/program-test)	8m 0s
test (token-upgrade/cli, token-upgrade/program)	7m 59s
cargo-test-sbf (token-upgrade/program)	7m 56s
cargo-test-sbf (feature-proposal/program)	7m 57s
cargo-test-sbf (governance/addin-mock/program, governance/program)	7m 57s
cargo-test-sbf (memo/program)	7m 38s
cargo-test-sbf (name-service/program)	7m 58s
cargo-test-sbf (stake-pool/program)	7m 58s
cargo-test-sbf (single-pool/program)	7m 58s
	1h 46m 2s

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