feat(chain,wallet)!: rm `ConfirmationTime` #6150

Job	Run time
Check no_std	37s
Build & Test Examples (example_cli)	23s
Build and test (stable, true, --no-default-features --features miniscript/no-std)	2m 7s
Build & Test Examples (example_bitcoind_rpc_polling)	32s
Check WASM	1m 15s
Build and test (stable, true, --all-features)	4m 3s
Rust fmt	5s
Build & Test Examples (example_electrum)	54s
Build and test (1.63.0, --no-default-features --features miniscript/no-std)	3m 19s
Build & Test Examples (example_esplora)	50s
prepare	6s
Build & Test Examples (example_wallet_electrum)	50s
Build & Test Examples (example_wallet_esplora_async)	1m 5s
Build and test (1.63.0, --all-features)	5m 34s
Build & Test Examples (example_wallet_esplora_blocking)	50s
Build & Test Examples (example_wallet_rpc)	32s
clippy_check	1m 11s
	24m 13s

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