Remove deprecated, unused methods from Bank #6814

Job	Run time
cargo-test-sbf (token/program)	9m 57s
check	3m 14s
cargo-test-sbf (instruction-padding/program, token/program-2022, token/program-2022-test)	14m 14s
cargo-test-sbf (associated-token-account/program, associated-token-account/program-test)	9m 21s
cargo-test-sbf (token-upgrade/program)	8m 50s
test (token/cli, token/program, token/program-2022, associated-token-account/program, instruction...	17m 48s
test (single-pool/cli, single-pool/program)	17m 49s
test (token-upgrade/cli, token-upgrade/program)	12m 47s
cargo-test-sbf (feature-proposal/program)	7m 44s
cargo-test-sbf (governance/addin-mock/program, governance/program)	11m 55s
cargo-test-sbf (memo/program)	7m 34s
cargo-test-sbf (name-service/program)	8m 38s
cargo-test-sbf (stake-pool/program)	12m 1s
cargo-test-sbf (single-pool/program)	9m 10s
	2h 31m 2s

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