Inserting transactions in the `Wallet` should always include a `last_seen`. #6151

Job	Run time
Check no_std	33s
Build and test (stable, true, --no-default-features --features miniscript/no-std)	2m 46s
Check WASM	1m 56s
Build and test (stable, true, --all-features)	4m 16s
prepare	4s
Build and test (1.63.0, --no-default-features --features miniscript/no-std)	3m 34s
Build & Test Examples (example_cli)	34s
Build and test (1.63.0, --all-features)	5m 41s
Rust fmt	11s
Build & Test Examples (example_bitcoind_rpc_polling)	36s
Build & Test Examples (example_electrum)	58s
Build & Test Examples (example_esplora)	1m 9s
Build & Test Examples (example_wallet_electrum)	56s
Build & Test Examples (example_wallet_esplora_async)	59s
Build & Test Examples (example_wallet_esplora_blocking)	49s
Build & Test Examples (example_wallet_rpc)	38s
clippy_check	1m 15s
	26m 55s

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