Define PohRecorder set_bank related test helper methods #2389

Job	Run time
test	0s
cargo-test-sbf (token/program)	17m 50s
check	0s
cargo-test-sbf (instruction-padding/program, token/program-2022, token/program-2022-test)	23m 39s
cargo-test-sbf (associated-token-account/program, associated-token-account/program-test)	17m 51s
cargo-test-sbf (token-upgrade/program)	16m 47s
cargo-test-sbf (feature-proposal/program)	13m 49s
cargo-test-sbf (governance/addin-mock/program, governance/program)	28m 55s
cargo-test-sbf (memo/program)	16m 39s
cargo-test-sbf (name-service/program)	13m 37s
cargo-test-sbf (stake-pool/program)	19m 32s
cargo-test-sbf (single-pool/program)	17m 33s
	3h 6m 12s

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