make new_from_bank to be only for tests #12720

Job	Run time
test (token/cli, token/program, token/program-2022, associated-token-account/program, instruction...	17m 9s
cargo-test-sbf (token/program)	9m 32s
test (single-pool/cli, single-pool/program)	17m 34s
check	4m 13s
cargo-test-sbf (instruction-padding/program, token/program-2022, token/program-2022-test)	15m 9s
test (token-upgrade/cli, token-upgrade/program)	15m 50s
cargo-test-sbf (associated-token-account/program, associated-token-account/program-test)	11m 24s
cargo-test-sbf (token-upgrade/program)	8m 57s
cargo-test-sbf (feature-proposal/program)	9m 8s
cargo-test-sbf (governance/addin-mock/program, governance/program)	13m 44s
cargo-test-sbf (memo/program)	8m 10s
cargo-test-sbf (name-service/program)	8m 26s
cargo-test-sbf (stake-pool/program)	12m 24s
cargo-test-sbf (single-pool/program)	9m 38s
	2h 41m 18s

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