test: use persist_test_utils to test file_store #23

Job	Run time
prepare	6s
Rust fmt	14s
Build & Test (1.88.0, true, --no-default-features --features miniscript/no-std,bdk_chain/hashbrown)	1m 20s
Rust clippy	38s
Check no_std	24s
Build & Test Examples (example_cli)	30s
Build & Test (1.63.0, --no-default-features --features miniscript/no-std,bdk_chain/hashbrown)	2m 9s
Check WASM	52s
Build & Test (1.63.0, --all-features)	3m 54s
Build & Test (1.88.0, true, --all-features)	3m 28s
Build & Test Examples (example_electrum)	55s
Build & Test Examples (example_esplora)	58s
Build & Test (1.75.0, --all-features)	4m 3s
Build & Test Examples (example_bitcoind_rpc_polling)	37s
Build & Test (1.75.0, --no-default-features --features miniscript/no-std,bdk_chain/hashbrown)	1m 37s
	21m 45s

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