[pallet-xcm] Adjust benchmarks (teleport_assets/reserve_transfer_assets) not relying on ED (#3464)

## Problem
During the bumping of the `polkadot-fellows` repository to
`polkadot-sdk@1.6.0`, I encountered a situation where the benchmarks
`teleport_assets` and `reserve_transfer_assets` in AssetHubKusama
started to fail. This issue arose due to a decreased ED balance for
AssetHubs introduced
[here](https://github.com/polkadot-fellows/runtimes/pull/158/files#diff-80668ff8e793b64f36a9a3ec512df5cbca4ad448c157a5d81abda1b15f35f1daR213),
and also because of a [missing CI
pipeline](https://github.com/polkadot-fellows/runtimes/issues/197) to
check the benchmarks, which went unnoticed.

These benchmarks expect the `caller` to have enough:
1. balance to transfer (BTT)
2. balance for paying delivery (BFPD).
 
So the initial balance was calculated as `ED * 100`, which seems
reasonable:
```
const ED_MULTIPLIER: u32 = 100;
let balance = existential_deposit.saturating_mul(ED_MULTIPLIER.into());`
```
The problem arises when the price for delivery is 100 times higher than
the existential deposit. In other words, when `ED * 100` does not cover
`BTT` + `BFPD`.

I check AHR/AHW/AHK/AHP and this problem has only AssetHubKusama
```
ED: 3333333
calculated price to parent delivery:  1031666634  (from xcm logs from the benchmark)
---

3333333 * 100 - BTT(3333333) - BFPD(1031666634) = −701666667
```
which results in the error;
```
2024-02-23 09:19:42 Unable to charge fee with error Module(ModuleError { index: 31, error: [17, 0, 0, 0], message: Some("FeesNotMet") })
Error: Input("Benchmark pallet_xcm::reserve_transfer_assets failed: FeesNotMet")
     
```

## Solution

The benchmarks `teleport_assets` and `reserve_transfer_assets` were
fixed by removing `ED * 100` and replacing it with `DeliveryHelper`
logic, which calculates the (almost real) price for delivery and sets it
along with the existential deposit as the initial balance for the
account used in the benchmark.


## TODO

- [ ] patch for 1.6 -
https://github.com/paritytech/polkadot-sdk/pull/3466
- [ ] patch for 1.7 -
https://github.com/paritytech/polkadot-sdk/pull/3465
- [ ] patch for 1.8 - TODO: PR

---------

Co-authored-by: Francisco Aguirre <franciscoaguirreperez@gmail.com>

cumulus/primitives/utility/src/lib.rs

@@ -760,7 +760,7 @@ mod test_trader {
 	}
 }
 
-/// Implementation of `pallet_xcm_benchmarks::EnsureDelivery` which helps to ensure delivery to the
+/// Implementation of `xcm_builder::EnsureDelivery` which helps to ensure delivery to the
 /// parent relay chain. Deposits existential deposit for origin (if needed).
 /// Deposits estimated fee to the origin account (if needed).
 /// Allows to trigger additional logic for specific `ParaId` (e.g. open HRMP channel) (if neeeded).
@@ -774,17 +774,22 @@ impl<
 		XcmConfig: xcm_executor::Config,
 		ExistentialDeposit: Get<Option<Asset>>,
 		PriceForDelivery: PriceForMessageDelivery<Id = ()>,
-	> pallet_xcm_benchmarks::EnsureDelivery
+	> xcm_builder::EnsureDelivery
 	for ToParentDeliveryHelper<XcmConfig, ExistentialDeposit, PriceForDelivery>
 {
 	fn ensure_successful_delivery(
 		origin_ref: &Location,
-		_dest: &Location,
+		dest: &Location,
 		fee_reason: xcm_executor::traits::FeeReason,
 	) -> (Option<xcm_executor::FeesMode>, Option<Assets>) {
 		use xcm::latest::{MAX_INSTRUCTIONS_TO_DECODE, MAX_ITEMS_IN_ASSETS};
 		use xcm_executor::{traits::FeeManager, FeesMode};
 
+		// check if the destination is relay/parent
+		if dest.ne(&Location::parent()) {
+			return (None, None);
+		}
+
 		let mut fees_mode = None;
 		if !XcmConfig::FeeManager::is_waived(Some(origin_ref), fee_reason) {
 			// if not waived, we need to set up accounts for paying and receiving fees