Remove deprecated spl-token conversion methods #6720

Job	Run time
test (token/cli, token/program, token/program-2022, associated-token-account/program, instruction...	18m 27s
test (single-pool/cli, single-pool/program)	18m 21s
cargo-test-sbf (token/program)	7m 55s
check	4m 10s
test (token-upgrade/cli, token-upgrade/program)	17m 13s
cargo-test-sbf (instruction-padding/program, token/program-2022, token/program-2022-test)	13m 36s
cargo-test-sbf (associated-token-account/program, associated-token-account/program-test)	10m 9s
cargo-test-sbf (token-upgrade/program)	9m 2s
cargo-test-sbf (feature-proposal/program)	8m 32s
cargo-test-sbf (governance/addin-mock/program, governance/program)	12m 57s
cargo-test-sbf (memo/program)	8m 11s
cargo-test-sbf (name-service/program)	7m 33s
cargo-test-sbf (stake-pool/program)	11m 43s
cargo-test-sbf (single-pool/program)	9m 49s
	2h 37m 38s

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