feat(testnet): XCM ExecuteFilter=Everything, zombienet config improve

[peterwht]

Sets the XCM config to allow arbitrary XCM execution.

This was merged for both Polkadot and Kusama chains, and is considered secure:

• polkadot chains: allow arbitrary XCM execution polkadot-fellows/runtimes#345
• kusama chains: allow arbitrary XCM execution polkadot-fellows/runtimes#261

Also adds asset hub to the zombienet config for testnet.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 11.21%. Comparing base (bae5887) to head (588afb9).
Report is 3 commits behind head on main.

@@           Coverage Diff           @@
##             main     #253   +/-   ##
=======================================
  Coverage   11.21%   11.21%           
=======================================
  Files          34       34           
  Lines        2577     2577           
  Branches     2577     2577           
=======================================
  Hits          289      289           
  Misses       2285     2285           
  Partials        3        3           

Files with missing lines	Coverage Δ
runtime/devnet/src/config/xcm.rs	0.00% <ø> (ø)
runtime/testnet/src/config/xcm.rs	0.00% <ø> (ø)

[evilrobot-01]

Could we rather add AH to the existing testnet network config file than add a new one?