test(electrum): test for checking that fee calculation is correct #6625

Job	Run time
prepare	2s
Rust fmt	10s
Check no_std	37s
Build & Test Examples (example_cli)	29s
Build and test (1.83.0, true, --no-default-features --features miniscript/no-std)	2m 18s
Build & Test Examples (example_bitcoind_rpc_polling)	39s
Check WASM	58s
Build and test (1.83.0, true, --all-features)	3m 51s
Build & Test Examples (example_electrum)	51s
Build and test (1.63.0, --no-default-features --features miniscript/no-std)	4m 10s
Build & Test Examples (example_esplora)	56s
Build and test (1.63.0, --all-features)	5m 45s
clippy_check	1m 11s
Build & Test Examples (example_wallet_electrum)	54s
Build & Test Examples (example_wallet_esplora_async)	57s
Build & Test Examples (example_wallet_esplora_blocking)	55s
Build & Test Examples (example_wallet_rpc)	42s
	25m 25s

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