[xcm] Setup filters/mock for xcm-executor tests

[bkontur]

Relates to: #5971 (comment)

Change xcm-executor/src/lib.rs:

-		#[cfg(not(any(test, feature = "runtime-benchmarks")))]
+		#[cfg(not(feature = "runtime-benchmarks")))]
		ensure!(
			Config::IsTeleporter::contains(&asset, &dest),
			XcmError::UntrustedTeleportLocation
		);

and

-		#[cfg(not(any(test, feature = "runtime-benchmarks")))]
+		#[cfg(not(feature = "runtime-benchmarks")))]
		for asset in assets.assets_iter() {
			ensure!(
				Config::IsReserve::contains(&asset, &reserve),
				XcmError::UntrustedReserveLocation
			);
		}