Refactor - Makes loader-v4 the default #16920

Job	Run time
check (associated-token-account)	4m 39s
test_cli (single-pool)	20m 42s
check (feature-proposal)	4m 56s
check (instruction-padding)	1m 11s
test_cli (token-2022)	17m 22s
check (memo)	2m 47s
check (record)	1m 11s
check (single-pool)	2m 1s
check (slashing)	1m 57s
cargo-test-sbf (associated-token-account)	8m 1s
check (stake-pool)	1m 41s
check (token-2022)	9m 1s
cargo-test-sbf (feature-proposal)	13m 25s
cargo-test-sbf (instruction-padding)	8m 6s
cargo-test-sbf (memo)	6m 6s
cargo-test-sbf (record)	12m 31s
cargo-test-sbf (single-pool)	11m 54s
cargo-test-sbf (slashing)	27m 35s
cargo-test-sbf (stake-pool)	9m 17s
cargo-test-sbf (token-2022)	6m 55s
	2h 51m 18s

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