[zk-sdk] Add fixed string tests for proofs #9905

Job	Run time
check	2m 32s
cargo-test-sbf (token/program)	8m 8s
cargo-test-sbf (instruction-padding/program, token/program-2022, token/program-2022-test)	13m 52s
test (token/cli, token/program, token/program-2022, associated-token-account/program, instruction...	13m 52s
cargo-test-sbf (associated-token-account/program, associated-token-account/program-test)	10m 4s
test (single-pool/cli, single-pool/program)	13m 44s
cargo-test-sbf (token-upgrade/program)	9m 14s
test (token-upgrade/cli, token-upgrade/program)	13m 52s
cargo-test-sbf (feature-proposal/program)	7m 6s
cargo-test-sbf (governance/addin-mock/program, governance/program)	11m 12s
cargo-test-sbf (memo/program)	7m 8s
cargo-test-sbf (name-service/program)	7m 20s
cargo-test-sbf (stake-pool/program)	12m 5s
cargo-test-sbf (single-pool/program)	9m 38s
	2h 19m 47s

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