Actually benchmark pallet_xcm::execute for all runtimes

[franciscoaguirre]

We removed a filter to allow arbitrary XCM execution in the runtimes, but if you actually try to call pallet_xcm::execute you'll get an error saying you exceed max weight.
This is because pallet_xcm::execute has max weight.
This was done to disallow it, now we should benchmark it again.

This is the case for most runtimes in the repo.

[bkontur]

@franciscoaguirre yes, you're right, exactly, I saw this when I did fresh weights comparision today: #433 - all are regenerated (just kusama is missing, I will push in few hours)

[franciscoaguirre]

My bad, didn't see that PR 🙈