Returns AccountHash from get_filler_account() #2765

Job	Run time
cargo-test-sbf (token/program)	22m 49s
check	0s
test	0s
cargo-test-sbf (instruction-padding/program, token/program-2022, token/program-2022-test)	30m 37s
cargo-test-sbf (associated-token-account/program, associated-token-account/program-test)	15m 24s
cargo-test-sbf (token-upgrade/program)	16m 13s
cargo-test-sbf (feature-proposal/program)	21m 57s
cargo-test-sbf (governance/addin-mock/program, governance/program)	27m 1s
cargo-test-sbf (memo/program)	21m 48s
cargo-test-sbf (name-service/program)	16m 14s
cargo-test-sbf (stake-pool/program)	25m 26s
cargo-test-sbf (single-pool/program)	17m 5s
	3h 34m 34s

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