v2.0: Simplify RPC partitioned_epoch_reward_enabled determination (backport of #2802) #9931

Job	Run time
cargo-test-sbf (token/program)	9m 13s
check	3m 15s
cargo-test-sbf (instruction-padding/program, token/program-2022, token/program-2022-test)	15m 42s
test (token/cli, token/program, token/program-2022, associated-token-account/program, instruction...	20m 8s
cargo-test-sbf (associated-token-account/program, associated-token-account/program-test)	10m 25s
test (single-pool/cli, single-pool/program)	20m 15s
test (token-upgrade/cli, token-upgrade/program)	18m 50s
cargo-test-sbf (token-upgrade/program)	10m 21s
cargo-test-sbf (feature-proposal/program)	9m 7s
cargo-test-sbf (governance/addin-mock/program, governance/program)	13m 18s
cargo-test-sbf (memo/program)	8m 48s
cargo-test-sbf (name-service/program)	9m 15s
cargo-test-sbf (stake-pool/program)	12m 46s
cargo-test-sbf (single-pool/program)	11m 16s
	2h 52m 39s

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