test validator: make feature accounts additive #13864

Job	Run time
cargo-test-sbf (token/program)	10m 7s
check	6m 15s
cargo-test-sbf (instruction-padding/program, token/program-2022, token/program-2022-test)	16m 16s
test (token/cli, token/program, token/program-2022, associated-token-account/program, instruction...	17m 15s
test (single-pool/cli, single-pool/program)	16m 57s
cargo-test-sbf (associated-token-account/program, associated-token-account/program-test)	9m 27s
test (token-upgrade/cli, token-upgrade/program)	6h 0m 14s
cargo-test-sbf (token-upgrade/program)	8m 58s
cargo-test-sbf (feature-proposal/program)	7m 45s
cargo-test-sbf (governance/addin-mock/program, governance/program)	14m 2s
cargo-test-sbf (memo/program)	7m 59s
cargo-test-sbf (name-service/program)	10m 6s
cargo-test-sbf (stake-pool/program)	11m 59s
cargo-test-sbf (single-pool/program)	9m 32s
	8h 26m 52s

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