[xcm] Fix `SovereignPaidRemoteExporter` and `DepositAsset` handling (#3157)
This PR addresses two issues: - It modifies `DepositAsset`'s asset filter from `All` to `AllCounted(1)` to prevent potentially charging excessive weight/fees. This adjustment avoids situations where fees could be calculated based on the count of assets, as illustrated [here](https://github.com/paritytech/polkadot-sdk/blob/master/cumulus/parachains/runtimes/bridge-hubs/bridge-hub-rococo/src/weights/xcm/mod.rs#L38-L46). - It encapsulates `DepositAsset` with `SetAppendix` to ensure that `fees` are not trapped in any case. For instance, this prevents issues when `ExportXcm::validate` encounters an error during the processing of `ExportMessage`.
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